Fix gcc v5.compiler errors.

storage/innobase/dict/dict0crea.c

@@ -1140,7 +1140,7 @@ dict_create_index_step(
 			>= DICT_TF_FORMAT_ZIP);
 
 		node->index = dict_index_get_if_in_cache_low(index_id);
-		ut_a(!node->index == (err != DB_SUCCESS));
+		ut_a(err == DB_SUCCESS ? node->index != NULL : node->index == NULL);
 
 		if (err != DB_SUCCESS) {
 

storage/innobase/log/log0recv.c

@@ -1763,7 +1763,7 @@ loop:
 		goto loop;
 	}
 
-	ut_ad(!allow_ibuf == mutex_own(&log_sys->mutex));
+	ut_ad(allow_ibuf == FALSE ? mutex_own(&log_sys->mutex) : !mutex_own(&log_sys->mutex));
 
 	if (!allow_ibuf) {
 		recv_no_ibuf_operations = TRUE;

storage/xtradb/dict/dict0crea.c

@@ -1255,7 +1255,7 @@ dict_create_index_step(
 			>= DICT_TF_FORMAT_ZIP);
 
 		node->index = dict_index_get_if_in_cache_low(index_id);
-		ut_a(!node->index == (err != DB_SUCCESS));
+		ut_a(err == DB_SUCCESS ? node->index != NULL : node->index == NULL);
 
 		if (err != DB_SUCCESS) {
 

storage/xtradb/log/log0recv.c

@@ -1840,7 +1840,7 @@ loop:
 		goto loop;
 	}
 
-	ut_ad(!allow_ibuf == mutex_own(&log_sys->mutex));
+	ut_ad(allow_ibuf == FALSE ? mutex_own(&log_sys->mutex) : !mutex_own(&log_sys->mutex));
 
 	if (!allow_ibuf) {
 		recv_no_ibuf_operations = TRUE;