Make sure to only call xfs_iext_get_ext after we've validate the
extent index when moving on to the next index in xfs_bmapi.

Based on an earlier patch from Lachlan McIlroy.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NLachlan McIlroy <lmcilroy@redhat.com>
Signed-off-by: NAlex Elder <aelder@sgi.com>