fs/xfs: Correct NULL test

Author: Julia Lawall <julia@diku.dk>

Test the value that was just allocated rather than the previously tested one.

A simplified version of the semantic match that finds this problem is as
follows: (http://coccinelle.lip6.fr/)

// 
@r@
expression *x;
expression e;
identifier l;
@@

if (x == NULL || ...) {
    ... when forall
    return ...; }
... when != goto l;
    when != x = e
    when != &x
*x == NULL
// 

Signed-off-by: Julia Lawall 
Reviewed-by: Christoph Hellwig 
Signed-off-by: Alex Elder 

---
 fs/xfs/quota/xfs_qm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
 
diff --git a/fs/xfs/quota/xfs_qm.c b/fs/xfs/quota/xfs_qm.c
index 8699e51..417e61e 100644
--- a/fs/xfs/quota/xfs_qm.c
+++ b/fs/xfs/quota/xfs_qm.c
@@ -123,7 +123,7 @@ xfs_Gqm_init(void)
 		goto out;
 
 	gdqhash = kmem_zalloc_large(hsize);
-	if (!udqhash)
+	if (!gdqhash)
 		goto out_free_udqhash;
 
 	hsize /= sizeof(xfs_dqhash_t);