gfs2: Revert "Add quota_change type"

[ Upstream commit ec4b5200c8af9ce021399d3192b3379c089396c3 ]

Commit 432928c9 ("gfs2: Add quota_change type") makes the incorrect
assertion that function do_qc() should behave differently in the two
contexts it is used in, but that isn't actually true.  In all cases,
do_qc() grabs a "reference" when it starts using a slot in the per-node
quota changes file, and it releases that "reference" when no more
residual changes remain.  Revert that broken commit.

There are some remaining issues with function do_qc() which are
addressed in the next commit.

This reverts commit 432928c9.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>