[PATCH] lib/raid6: fix preprocessor warning

This patch fixes the following preprocessor warning:
lib/raid6/recov_avx2.c:11:5: warning: "CONFIG_AS_AVX2" is not defined [-Wundef]

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Cc: stable@kernel.org	# 3.8+

---
 lib/raid6/recov_avx2.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-3.12.3/lib/raid6/recov_avx2.c
===================================================================

--- linux-3.12.3.orig/lib/raid6/recov_avx2.c	2013-12-05 19:54:41.000000000 +0100
+++ linux-3.12.3/lib/raid6/recov_avx2.c	2013-12-05 19:54:46.000000000 +0100

@@ -8,7 +8,7 @@
  * of the License.
  */
 
-#if CONFIG_AS_AVX2
+#ifdef CONFIG_AS_AVX2
 
 #include <linux/raid/pq.h>
 #include "x86.h"