jbd2: clean up indentation issue, replace spaces with tab

There is a statement that is indented with spaces, replace it with
a tab.

Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

fs/jbd2/transaction.c

@@ -943,7 +943,7 @@ repeat:
 	 * this is the first time this transaction is touching this buffer,
 	 * reset the modified flag
 	 */
-       jh->b_modified = 0;
+	jh->b_modified = 0;
 
 	/*
 	 * If the buffer is not journaled right now, we need to make sure it