test: check uv_ip4_addr return value

Fixes Coverity errors.

PR-URL: https://github.com/nodejs/node/pull/13878
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

test/cctest/test_inspector_socket.cc

@@ -370,7 +370,7 @@ class InspectorSocketTest : public ::testing::Test {
     sockaddr_in addr;
     uv_tcp_init(&loop, &server);
     uv_tcp_init(&loop, &client_socket);
-    uv_ip4_addr("127.0.0.1", PORT, &addr);
+    GTEST_ASSERT_EQ(0, uv_ip4_addr("127.0.0.1", PORT, &addr));
     uv_tcp_bind(&server, reinterpret_cast<const struct sockaddr*>(&addr), 0);
     GTEST_ASSERT_EQ(0, uv_listen(reinterpret_cast<uv_stream_t*>(&server),
                                  1, on_new_connection));

test/cctest/test_inspector_socket_server.cc

@@ -194,10 +194,11 @@ class SocketWrapper {
     contents_.clear();
     uv_tcp_init(loop_, &socket_);
     sockaddr_in addr;
-    uv_ip4_addr(host.c_str(), port, &addr);
-    int err = uv_tcp_connect(&connect_, &socket_,
-                             reinterpret_cast<const sockaddr*>(&addr),
-                             ConnectionMustFail_);
+    int err = uv_ip4_addr(host.c_str(), port, &addr);
+    ASSERT_EQ(0, err);
+    err = uv_tcp_connect(&connect_, &socket_,
+                         reinterpret_cast<const sockaddr*>(&addr),
+                         ConnectionMustFail_);
     ASSERT_EQ(0, err);
     SPIN_WHILE(!connection_failed_)
     uv_read_start(reinterpret_cast<uv_stream_t*>(&socket_), AllocCallback,