8026806: Incomplete test of getaddrinfo() return value could lead to incorrect...

8026806: Incomplete test of getaddrinfo() return value could lead to incorrect exception for Windows Inet 6
Summary: Check getaddrinfo return value before calling WSAGetLastError.
Reviewed-by: alanb, dsamersoff

src/windows/native/java/net/Inet6AddressImpl.c

@@ -131,18 +131,20 @@ Java_java_net_Inet6AddressImpl_lookupAllHostAddr(JNIEnv *env, jobject this,
 
     error = getaddrinfo(hostname, NULL, &hints, &res);
 
+    if (error) {
         if (WSAGetLastError() == WSATRY_AGAIN) {
             NET_ThrowByNameWithLastError(env,
                                          JNU_JAVANETPKG "UnknownHostException",
                                          hostname);
             JNU_ReleaseStringPlatformChars(env, host, hostname);
             return NULL;
-    } else if (error) {
+        } else {
             /* report error */
             JNU_ThrowByName(env, JNU_JAVANETPKG "UnknownHostException",
                             (char *)hostname);
             JNU_ReleaseStringPlatformChars(env, host, hostname);
             return NULL;
+        }
     } else {
         int i = 0;
         int inetCount = 0, inet6Count = 0, inetIndex, inet6Index;