xfs: remove xfs_bmap_sanity_check()

This code is redundant now that we have verifiers that sanity check
the buffers as they are read from disk.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>