*: un-split strings across lines

Remove mid-string line breaks, cf. workflow doc:

  .. [#tool_style_conflicts] For example, lines over 80 characters are allowed
     for text strings to make it possible to search the code for them: please
     see `Linux kernel style (breaking long lines and strings)
     <https://www.kernel.org/doc/html/v4.10/process/coding-style.html#breaking-long-lines-and-strings>`_
     and `Issue #1794 <https://github.com/FRRouting/frr/issues/1794>`_.

Scripted commit, idempotent to running:
```
python3 tools/stringmangle.py --unwrap `git ls-files | egrep '\.[ch]$'`
```

Signed-off-by: David Lamparter <equinox@diac24.net>

3 files changed, 8 insertions, 16 deletions

diff --git a/babeld/babel_interface.c b/babeld/babel_interface.c
index 772aec123..1702d9277 100644
--- a/babeld/babel_interface.c
+++ b/babeld/babel_interface.c
@@ -692,8 +692,7 @@ interface_recalculate(struct interface *ifp)
 
     rc = resize_receive_buffer(mtu);
     if(rc < 0)
-        zlog_warn("couldn't resize "
-                  "receive buffer for interface %s (%d) (%d bytes).\n",
+        zlog_warn("couldn't resize receive buffer for interface %s (%d) (%d bytes).\n",
                   ifp->name, ifp->ifindex, mtu);
 
     memset(&mreq, 0, sizeof(mreq));
@@ -896,8 +895,7 @@ static void
 show_babel_neighbour_sub (struct vty *vty, struct neighbour *neigh)
 {
     vty_out (vty,
-             "Neighbour %s dev %s reach %04x rxcost %d txcost %d "
-             "rtt %s rttcost %d%s.\n",
+             "Neighbour %s dev %s reach %04x rxcost %d txcost %d rtt %s rttcost %d%s.\n",
              format_address(neigh->address),
              neigh->ifp->name,
              neigh->reach,
@@ -988,8 +986,7 @@ show_babel_routes_sub(struct babel_route *route, struct vty *vty,
     }
 
     vty_out (vty,
-            "%s metric %d refmetric %d id %s seqno %d%s age %d "
-            "via %s neigh %s%s%s%s\n",
+            "%s metric %d refmetric %d id %s seqno %d%s age %d via %s neigh %s%s%s%s\n",
             format_prefix(route->src->prefix, route->src->plen),
             route_metric(route), route->refmetric,
             format_eui64(route->src->id),
diff --git a/babeld/message.c b/babeld/message.c
index d88790824..c9a10cb1c 100644
--- a/babeld/message.c
+++ b/babeld/message.c
@@ -710,8 +710,7 @@ fill_rtt_message(struct interface *ifp)
             DO_HTONL(babel_ifp->sendbuf + babel_ifp->buffered_hello + 10, time);
             return 1;
         } else {
-            flog_err(EC_BABEL_PACKET, "No space left for timestamp sub-TLV "
-                     "(this shouldn't happen)");
+            flog_err(EC_BABEL_PACKET, "No space left for timestamp sub-TLV (this shouldn't happen)");
             return -1;
         }
     }
diff --git a/babeld/route.c b/babeld/route.c
index ab104aa2b..0f6f6486f 100644
--- a/babeld/route.c
+++ b/babeld/route.c
@@ -399,16 +399,14 @@ install_route(struct babel_route *route)
         return;
 
     if(!route_feasible(route))
-        flog_err(EC_BABEL_ROUTE, "WARNING: installing unfeasible route "
-                  "(this shouldn't happen).");
+        flog_err(EC_BABEL_ROUTE, "WARNING: installing unfeasible route (this shouldn't happen).");
 
     i = find_route_slot(route->src->prefix, route->src->plen, NULL);
     assert(i >= 0 && i < route_slots);
 
     if(routes[i] != route && routes[i]->installed) {
         flog_err(EC_BABEL_ROUTE,
-		  "WARNING: attempting to install duplicate route "
-                  "(this shouldn't happen).");
+		  "WARNING: attempting to install duplicate route (this shouldn't happen).");
         return;
     }
 
@@ -465,8 +463,7 @@ switch_routes(struct babel_route *old, struct babel_route *new)
         return;
 
     if(!route_feasible(new))
-        flog_err(EC_BABEL_ROUTE, "WARNING: switching to unfeasible route "
-                  "(this shouldn't happen).");
+        flog_err(EC_BABEL_ROUTE, "WARNING: switching to unfeasible route (this shouldn't happen).");
 
     rc = kernel_route(ROUTE_MODIFY, old->src->prefix, old->src->plen,
                       old->nexthop, old->neigh->ifp->ifindex,
@@ -835,8 +832,7 @@ update_route(const unsigned char *router_id,
            in a timely manner.  If the source remains the same, we ignore
            the update. */
         if(!feasible && route->installed) {
-            debugf(BABEL_DEBUG_COMMON,"Unfeasible update for installed route to %s "
-                   "(%s %d %d -> %s %d %d).",
+            debugf(BABEL_DEBUG_COMMON,"Unfeasible update for installed route to %s (%s %d %d -> %s %d %d).",
                    format_prefix(src->prefix, src->plen),
                    format_eui64(route->src->id),
                    route->seqno, route->refmetric,