Fixed processing Unix listening socket failures.

This is related to issue #198 on GitHub.

src/nxt_main_process.c

@@ -1116,11 +1116,9 @@ nxt_main_listening_socket(nxt_sockaddr_t *sa, nxt_listening_socket_t *ls)
                 break;
             }
 
-            goto next;
-        }
-
+        } else
 #endif
-
+        {
             switch (err) {
 
             case EACCES:
@@ -1135,6 +1133,7 @@ nxt_main_listening_socket(nxt_sockaddr_t *sa, nxt_listening_socket_t *ls)
                 ls->error = NXT_SOCKET_ERROR_NOADDR;
                 break;
             }
+        }
 
         ls->end = nxt_sprintf(ls->start, ls->end, "bind(\\\"%*s\\\") failed %E",
                               (size_t) sa->length, nxt_sockaddr_start(sa), err);
@@ -1143,8 +1142,6 @@ nxt_main_listening_socket(nxt_sockaddr_t *sa, nxt_listening_socket_t *ls)
 
 #if (NXT_HAVE_UNIX_DOMAIN)
 
-next:
-
     if (sa->u.sockaddr.sa_family == AF_UNIX) {
         char     *filename;
         mode_t   access;