test: fix Coverity warning in inspector test

PR-URL: https://github.com/nodejs/node/pull/10510
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

test/cctest/test_inspector_socket_server.cc

@@ -70,7 +70,7 @@ class Timeout {
 class InspectorSocketServerTest : public ::testing::Test {
  protected:
   void SetUp() override {
-    uv_loop_init(&loop);
+    EXPECT_EQ(0, uv_loop_init(&loop));
   }
 
   void TearDown() override {