xfs: remove post-bmap tracing in xfs_bmap_local_to_extents

Now that we use xfs_iext_insert this is already covered by the tracing
in that function.

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>