xfs: pass per-ag references to xfs_free_extent

xfs: pass per-ag references to xfs_free_extent

Source kernel commit: b2ccab3199aa7cea9154d80ea2585312c5f6eba0

Pass a reference to the per-AG structure to xfs_free_extent.  Most
callers already have one, so we can eliminate unnecessary lookups.  The
one exception to this is the EFI code, which the next patch will fix.

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