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>
diff --git a/fs/namei.c b/fs/namei.c
index 02803bd..cf3fc8d 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -4369,7 +4369,7 @@
 	if (error)
 		return error;
 
-	if (!old_dir->i_op->rename2)
+	if (!old_dir->i_op->rename)
 		return -EPERM;
 
 	/*
@@ -4425,7 +4425,7 @@
 		if (error)
 			goto out;
 	}
-	error = old_dir->i_op->rename2(old_dir, old_dentry,
+	error = old_dir->i_op->rename(old_dir, old_dentry,
 				       new_dir, new_dentry, flags);
 	if (error)
 		goto out;