xfs: remove xfs_bunmapi() firstblock param

All callers pass ->t_firstblock from the current transaction.

Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-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>
diff --git a/fs/xfs/xfs_symlink.c b/fs/xfs/xfs_symlink.c
index 94301b6..a3dc552 100644
--- a/fs/xfs/xfs_symlink.c
+++ b/fs/xfs/xfs_symlink.c
@@ -460,8 +460,7 @@ xfs_inactive_symlink_rmt(
 	/*
 	 * Unmap the dead block(s) to the dfops.
 	 */
-	error = xfs_bunmapi(tp, ip, 0, size, 0, nmaps, &tp->t_firstblock,
-			    &done);
+	error = xfs_bunmapi(tp, ip, 0, size, 0, nmaps, &done);
 	if (error)
 		goto error_bmap_cancel;
 	ASSERT(done);