rcS: cast format string to int64_t

musl 1.2.0 turns time_t into a 64-bit value, even on 32-bit. This makes it
compatible.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

rcS.c

@@ -18,6 +18,7 @@
 
 #include <libubox/uloop.h>
 #include <libubox/runqueue.h>
+#include <inttypes.h>
 #include <stdlib.h>
 #include <stdio.h>
 #include <unistd.h>
@@ -118,7 +119,7 @@ static void q_initd_complete(struct runqueue *q, struct runqueue_task *p)
 		ts_res.tv_nsec += 1000000000;
 	}
 
-	DEBUG(2, "stop %s %s - took %lu.%09lus\n", s->file, s->param, ts_res.tv_sec, ts_res.tv_nsec);
+	DEBUG(2, "stop %s %s - took %" PRId64 ".%09" PRId64 "s\n", s->file, s->param, (int64_t)ts_res.tv_sec, (int64_t)ts_res.tv_nsec);
 	ustream_free(&s->fd.stream);
 	close(s->fd.fd.fd);
 	free(s);