fs: rename "rename2" i_op to "rename"

Generated patch:

sed -i "s/\.rename2\t/\.rename\t\t/" `git grep -wl rename2`
sed -i "s/\brename2\b/rename/g" `git grep -wl rename2`

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

fs/overlayfs/dir.c

@@ -996,7 +996,7 @@ const struct inode_operations ovl_dir_inode_operations = {
 	.symlink	= ovl_symlink,
 	.unlink		= ovl_unlink,
 	.rmdir		= ovl_rmdir,
-	.rename2	= ovl_rename2,
+	.rename		= ovl_rename2,
 	.link		= ovl_link,
 	.setattr	= ovl_setattr,
 	.create		= ovl_create,