bcachefs: Fix divide by zero in rebalance_work()

This fixes https://github.com/koverstreet/bcachefs-tools/issues/159

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2023-08-17 16:35:58 -04:00
commit d0445e131e