files: Print resource IDs in hex format

We usually print resources IDs in hex format,
so fix the places where we don't (it confuses
otherwise).
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

files.c

@@ -381,7 +381,7 @@ static int collect_fd(int pid, FdinfoEntry *e, struct rst_info *rst_info)
 
 	fdesc = find_file_desc(e);
 	if (fdesc == NULL) {
-		pr_err("No file for fd %d id %d\n", e->fd, e->id);
+		pr_err("No file for fd %d id %#x\n", e->fd, e->id);
 		return -1;
 	}