silent warning

src/core/sched_ctx.c

@@ -481,7 +481,7 @@ unsigned starpu_sched_ctx_create(int *workerids, int nworkers, const char *sched
 	int max_prio_set = 0;
 	int min_prio = 0;
 	int max_prio = 0;
-	struct starpu_sched_policy *sched_policy;
+	struct starpu_sched_policy *sched_policy = NULL;
 	unsigned hierarchy_level = 0;
 
 	va_start(varg_list, sched_ctx_name);