xfs: return an offset instead of a pointer from xlog_align

This simplifies both the helper and the callers.  We lost a bit of
size sanity checking, but that is already covered by KASAN if needed.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>

fs/xfs/xfs_log_recover.c

@@ -151,20 +151,14 @@ xlog_put_bp(
  * Return the address of the start of the given block number's data
  * in a log buffer.  The buffer covers a log sector-aligned region.
  */
-STATIC char *
+static inline unsigned int
 xlog_align(
 	struct xlog	*log,
-	xfs_daddr_t	blk_no,
-	int		nbblks,
-	struct xfs_buf	*bp)
+	xfs_daddr_t	blk_no)
 {
-	xfs_daddr_t	offset = blk_no & ((xfs_daddr_t)log->l_sectBBsize - 1);
-
-	ASSERT(offset + nbblks <= bp->b_length);
-	return bp->b_addr + BBTOB(offset);
+	return BBTOB(blk_no & ((xfs_daddr_t)log->l_sectBBsize - 1));
 }
 
-
 /*
  * nbblks should be uint, but oh well.  Just want to catch that 32-bit length.
  */
@@ -216,7 +210,7 @@ xlog_bread(
 	if (error)
 		return error;
 
-	*offset = xlog_align(log, blk_no, nbblks, bp);
+	*offset = bp->b_addr + xlog_align(log, blk_no);
 	return 0;
 }
 
@@ -1713,7 +1707,7 @@ xlog_write_log_records(
 
 		}
 
-		offset = xlog_align(log, start_block, endcount, bp);
+		offset = bp->b_addr + xlog_align(log, start_block);
 		for (; j < endcount; j++) {
 			xlog_add_record(log, offset, cycle, i+j,
 					tail_cycle, tail_block);