ospfd: add format attributes

[Sebastian Benoit]

In ospfd, add format attributes to the proper functions and then fix the
warning in rde.c.

ok?

diff --git log.h log.h
index e0034e8..a682f67 100644
--- log.h
+++ log.h
@@ -23,13 +23,21 @@
 
 void   log_init(int);
 void   log_verbose(int);
-void   logit(int, const char *, ...);
-void   vlog(int, const char *, va_list);
-void   log_warn(const char *, ...);
-void   log_warnx(const char *, ...);
-void   log_info(const char *, ...);
-void   log_debug(const char *, ...);
-void   fatal(const char *) __dead;
-void   fatalx(const char *) __dead;
+void   logit(int, const char *, ...)
+               __attribute__((__format__ (printf, 2, 3)));
+void   vlog(int, const char *, va_list)
+               __attribute__((__format__ (printf, 2, 0)));
+void   log_warn(const char *, ...)
+               __attribute__((__format__ (printf, 1, 2)));
+void   log_warnx(const char *, ...)
+               __attribute__((__format__ (printf, 1, 2)));
+void   log_info(const char *, ...)
+               __attribute__((__format__ (printf, 1, 2)));
+void   log_debug(const char *, ...)
+               __attribute__((__format__ (printf, 1, 2)));
+void   fatal(const char *) __dead
+               __attribute__((__format__ (printf, 1, 0)));
+void   fatalx(const char *) __dead
+               __attribute__((__format__ (printf, 1, 0)));
 
 #endif /* _LOG_H_ */
diff --git rde.c rde.c
index 6d53eb3..eca497a 100644
--- rde.c
+++ rde.c
@@ -374,7 +374,7 @@ rde_dispatch_imsg(int fd, short event, void *bula)
                                }
                        }
                        if (l != 0 && !error)
-                               log_warnx("rde_dispatch_imsg: peerid %lu, "
+                               log_warnx("rde_dispatch_imsg: peerid %u, "
                                    "trailing garbage in Database Description "
                                    "packet", imsg.hdr.peerid);
 
@@ -411,7 +411,7 @@ rde_dispatch_imsg(int fd, short event, void *bula)
                                    ntohs(v->lsa->hdr.len));
                        }
                        if (l != 0)
-                               log_warnx("rde_dispatch_imsg: peerid %lu, "
+                               log_warnx("rde_dispatch_imsg: peerid %u, "
                                    "trailing garbage in LS Request "
                                    "packet", imsg.hdr.peerid);
                        break;