scoutfs: add missing segment put

Back when we changed the transaction commit to ask the server to update
the commit we accidentally lost the put of the level0 segment that was
just written.  This leaked refcount would pin segments over time and
eventually drag the box into crippling oom.

Signed-off-by: Zach Brown <zab@versity.com>

kmod/src/trans.c

@@ -112,7 +112,7 @@ void scoutfs_trans_write_func(struct work_struct *work)
 	struct super_block *sb = sbi->sb;
 	DECLARE_TRANS_INFO(sb, tri);
 	struct scoutfs_bio_completion comp;
-	struct scoutfs_segment *seg;
+	struct scoutfs_segment *seg = NULL;
 	u64 segno;
 	int ret = 0;
 
@@ -138,6 +138,7 @@ void scoutfs_trans_write_func(struct work_struct *work)
 		      scoutfs_bio_wait_comp(sb, &comp) ?:
 		      scoutfs_net_record_segment(sb, seg, 0) ?:
 		      scoutfs_net_advance_seq(sb, &sbi->trans_seq);
+		scoutfs_seg_put(seg);
 		if (ret)
 			goto out;