Initialize is_balancer field in various tests.

test/core/client_config/resolvers/dns_resolver_connectivity_test.c

@@ -81,6 +81,7 @@ static grpc_error *my_resolve_address(const char *name, const char *addr,
     (*addrs)->naddrs = 1;
     (*addrs)->addrs = gpr_malloc(sizeof(*(*addrs)->addrs));
     (*addrs)->addrs[0].len = 123;
+    (*addrs)->addrs[0].is_balancer = false;
     return GRPC_ERROR_NONE;
   }
 }

test/core/end2end/fuzzers/api_fuzzer.c

@@ -200,6 +200,7 @@ static void finish_resolve(grpc_exec_ctx *exec_ctx, void *arg,
     addrs->naddrs = 1;
     addrs->addrs = gpr_malloc(sizeof(*addrs->addrs));
     addrs->addrs[0].len = 0;
+    addrs->addrs[0].is_balancer = false;
     *r->addrs = addrs;
     grpc_exec_ctx_sched(exec_ctx, r->on_done, GRPC_ERROR_NONE, NULL);
   } else {

test/core/iomgr/resolve_address_test.c

@@ -63,6 +63,7 @@ static void must_succeed(grpc_exec_ctx *exec_ctx, void *argsp,
   GPR_ASSERT(err == GRPC_ERROR_NONE);
   GPR_ASSERT(args->addrs != NULL);
   GPR_ASSERT(args->addrs->naddrs > 0);
+  GPR_ASSERT(args->addrs->is_balancer == false);
   gpr_event_set(&args->ev, (void *)1);
 }