9p: double iput() in ->lookup() if d_materialise_unique() fails

d_materialise_unique() does iput() itself.

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 ce601d7..cbee5ec 100644
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -841,7 +841,6 @@
 	if (!IS_ERR(res))
 		return res;
 	result = PTR_ERR(res);
-	iput(inode);
 error:
 	p9_client_clunk(fid);