switch vfs_getattr() to struct path

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index ae12512..8031a8c 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -1139,7 +1139,7 @@
 
 	if (lo->lo_state != Lo_bound)
 		return -ENXIO;
-	error = vfs_getattr(file->f_path.mnt, file->f_path.dentry, &stat);
+	error = vfs_getattr(&file->f_path, &stat);
 	if (error)
 		return error;
 	memset(info, 0, sizeof(*info));