8080486: JNI exception pending in...

8080486: JNI exception pending in jdk/src/java.base/windows/native/libnet/DualStackPlainSocketImpl.c
Reviewed-by: alanb, chegar, igerasim
Contributed-by: vyom.tewari@oracle.com

src/share/native/java/net/InetAddress.c

@@ -58,6 +58,7 @@ Java_java_net_InetAddress_init(JNIEnv *env, jclass cls) {
         c = (*env)->FindClass(env,"java/net/InetAddress$InetAddressHolder");
         CHECK_NULL(c);
         iac_class = (*env)->NewGlobalRef(env, c);
+        CHECK_NULL(iac_class);
         ia_holderID = (*env)->GetFieldID(env, ia_class, "holder", "Ljava/net/InetAddress$InetAddressHolder;");
         CHECK_NULL(ia_holderID);
         ia_preferIPv6AddressID = (*env)->GetStaticFieldID(env, ia_class, "preferIPv6Address", "Z");

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

@@ -47,6 +47,7 @@ JNIEXPORT void JNICALL Java_java_net_DualStackPlainSocketImpl_initIDs
     isa_class = (*env)->NewGlobalRef(env, cls);
     isa_ctorID = (*env)->GetMethodID(env, cls, "<init>",
                                      "(Ljava/net/InetAddress;I)V");
+    CHECK_NULL(isa_ctorID);
 
     // implement read timeout with select.
     isRcvTimeoutSupported = 0;