[regression] ocfs2: do *not* increment ->ki_pos twice

generic_file_direct_write() already does that.  Broken by
"ocfs2: do not fallback to buffer I/O write if appending"
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

fs/ocfs2/file.c

@@ -2394,7 +2394,6 @@ static ssize_t ocfs2_file_write_iter(struct kiocb *iocb,
 		/*
 		 * for completing the rest of the request.
 		 */
-		*ppos += written;
 		count -= written;
 		written_buffered = generic_perform_write(file, from, *ppos);
 		/*