microblaze: Fix futex code

Use logical and NOT for ANDN. It was likely type fault.

Signed-off-by: Michal Simek <monstr@monstr.eu>
diff --git a/arch/microblaze/include/asm/futex.h b/arch/microblaze/include/asm/futex.h
index 8dbb6e7..ad3fd61 100644
--- a/arch/microblaze/include/asm/futex.h
+++ b/arch/microblaze/include/asm/futex.h
@@ -55,7 +55,7 @@
 		__futex_atomic_op("or %1,%0,%4;", ret, oldval, uaddr, oparg);
 		break;
 	case FUTEX_OP_ANDN:
-		__futex_atomic_op("and %1,%0,%4;", ret, oldval, uaddr, oparg);
+		__futex_atomic_op("andn %1,%0,%4;", ret, oldval, uaddr, oparg);
 		break;
 	case FUTEX_OP_XOR:
 		__futex_atomic_op("xor %1,%0,%4;", ret, oldval, uaddr, oparg);