bcachefs: Don't stop copygc thread on device resize

copygc no longer has to scan the buckets, so it's no longer a problem if
the number of buckets is changing while it's running.

This also fixes a bug where we forgot to restart copygc.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2023-11-24 00:54:43 -05:00
commit 202a7c292e