Merge pull request #308 from ctiller/asan

Fix initialization compile error

test/core/fling/client.c

@@ -113,7 +113,7 @@ int main(int argc, char **argv) {
   char *target = "localhost:443";
   gpr_cmdline *cl;
   char *scenario_name = "ping-pong-request";
-  scenario sc = {NULL};
+  scenario sc = {NULL, NULL, NULL};
 
   GPR_ASSERT(argc >= 1);
   fake_argv[0] = argv[0];