xfs: factor xfs_alloc_vextent_this_ag() for _iterate_ags()

xfs: factor xfs_alloc_vextent_this_ag() for  _iterate_ags()

Source kernel commit: 2edf06a50f5bbe664283f3c55c480fc013221d70

The core of the per-ag iteration is effectively doing a "this ag"
allocation on one AG at a time. Use the same code to implement the
core "this ag" allocation in both xfs_alloc_vextent_this_ag()
and xfs_alloc_vextent_iterate_ags().

This means we only call xfs_alloc_ag_vextent() from one place so we
can easily collapse the call stack in future patches.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Carlos Maiolino <cem@kernel.org>