ext4: minor fix in jbd2 stats kmalloc failure case

(Mingming: these 4 patches can apply after jbd-stats-through-procfs-with-external-journal-oops-fix.patch)

---------------------------------------------------------------------

The other instance of this problem was caught, but this one got missed:
Free the correct pointer on s->stats allocation failure in jbd2_seq_info_open

---

Index: linux-2.6.24-rc3/fs/jbd2/journal.c
===================================================================
@@ -850,7 +850,7 @@ static int jbd2_seq_info_open(struct ino
 		return -EIO;
 	size = sizeof(struct transaction_stats_s);
 	s->stats = kmalloc(size, GFP_KERNEL);
-	if (s == NULL) {
+	if (s->stats == NULL) {
 		kfree(s);
 		return -EIO;
 	}

Thanks Eric, looks all good to me. Updated the patch queue with the four jbd2 stats fixes from you.

Mingming