[SCSI] qla2xxx: Fix __LITTLE_ENDIAN definition warnings

On ppc64, gcc 4.4 spews lots of..

drivers/scsi/qla2xxx/qla_def.h:1485:7: warning: "__LITTLE_ENDIAN" is not defined

Signed-off-by: Dave Jones <davej@redhat.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
diff --git a/drivers/scsi/qla2xxx/qla_def.h b/drivers/scsi/qla2xxx/qla_def.h
index 00aa48d..9fde8bf 100644
--- a/drivers/scsi/qla2xxx/qla_def.h
+++ b/drivers/scsi/qla2xxx/qla_def.h
@@ -1482,7 +1482,7 @@
 		uint8_t domain;
 		uint8_t area;
 		uint8_t al_pa;
-#elif __LITTLE_ENDIAN
+#elif defined(__LITTLE_ENDIAN)
 		uint8_t al_pa;
 		uint8_t area;
 		uint8_t domain;