gfs2: Add extra error check in alloc_dinode

We have reserved the number of blocks we want to allocate, so the actual
allocation isn't expected to fail.  Nevertheless, make the code behave
correctly even when things go wrong.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>

fs/gfs2/inode.c

@@ -403,12 +403,15 @@ static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks)
 		goto out_ipreserv;
 
 	error = gfs2_alloc_blocks(ip, &ip->i_no_addr, dblocks, 1, &ip->i_generation);
+	if (error)
+		goto out_trans_end;
+
 	ip->i_no_formal_ino = ip->i_generation;
 	ip->i_inode.i_ino = ip->i_no_addr;
 	ip->i_goal = ip->i_no_addr;
 
+out_trans_end:
 	gfs2_trans_end(sdp);
-
 out_ipreserv:
 	gfs2_inplace_release(ip);
 out_quota: