bcachefs: Add missing bch2_journal_do_writes() call

This fixes a rare deadlock when we're doing an emergency shutdown due to
failure to do a journal write.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

fs/bcachefs/journal_io.c

@@ -1677,6 +1677,13 @@ static CLOSURE_CALLBACK(journal_write_done)
 		mod_delayed_work(j->wq, &j->write_work, max(0L, delta));
 	}
 
+	/*
+	 * We don't typically trigger journal writes from her - the next journal
+	 * write will be triggered immediately after the previous one is
+	 * allocated, in bch2_journal_write() - but the journal write error path
+	 * is special:
+	 */
+	bch2_journal_do_writes(j);
 	spin_unlock(&j->lock);
 }