9p: use clone_fid()

in a bunch of places it cleans the things up

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
index 26189ee..8b1999b 100644
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -661,7 +661,7 @@
 	}
 
 	/* clone a fid to use for creation */
-	ofid = p9_client_walk(dfid, 0, NULL, 1);
+	ofid = clone_fid(dfid);
 	if (IS_ERR(ofid)) {
 		err = PTR_ERR(ofid);
 		p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);