bcachefs: Fix btree_gc when multiple passes required

We weren't resetting filesystem & device usage when restarting gc, which
was spotted when free bucket counters overflowed - whoops.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2022-12-13 14:43:03 -05:00
commit 14d7d61fac