bcachefs: Don't touch journal_buf->data->seq in journal_res_get

This is a small optimization, reducing the number of cachelines we touch
in the fast path - and it's also necessary for the next patch that
increases JOURNAL_BUF_NR.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2025-01-23 13:06:35 -05:00
commit 2e853fdbc7