criu: fix leaks detected by coverity scan part 2

*** CID 179043:    (USE_AFTER_FREE)
close bfd fd safe so that we won't have double close

*** CID 179041:  Resource leaks  (RESOURCE_LEAK)
don't forget to close fd on error
Signed-off-by: Pavel Tikhomirov <ptikhomirov@virtuozzo.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>

criu/bfd.c

@@ -91,7 +91,7 @@ static void buf_put(struct xbuf *xb)
 static int bfdopen(struct bfd *f, bool writable)
 {
 	if (buf_get(&f->b)) {
-		close(f->fd);
+		close_safe(&f->fd);
 		return -1;
 	}
 

criu/kerndat.c

@@ -769,6 +769,7 @@ static int kerndat_try_load_cache(void)
 	ret = read(fd, &kdat, sizeof(kdat));
 	if (ret < 0) {
 		pr_perror("Can't read kdat cache");
+		close(fd);
 		return -1;
 	}