files: Fix compilation on PI

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

files-reg.c

@@ -700,7 +700,7 @@ int open_path(struct file_desc *d,
 		}
 
 		if (st.st_size != rfi->rfe->size) {
-			pr_err("File %s has bad size %lu (expect %lu)\n",
+			pr_err("File %s has bad size %"PRIu64" (expect %"PRIu64")\n",
 					rfi->path, st.st_size,
 					(unsigned long)rfi->rfe->size);
 			return -1;