RFR : 8047777: Build broken: ProcessEnvironment_md.c not compiling

[Seán Coffey]

The JDK-8036603 fix pushed on Friday broke windows builds. Bad macro 
call. Simple fix :
https://bugs.openjdk.java.net/browse/JDK-8047777
applicable to jdk8u-dev only.
--- a/src/windows/native/java/lang/ProcessEnvironment_md.c
+++ b/src/windows/native/java/lang/ProcessEnvironment_md.c
@@ -41,7 +41,7 @@
     CHECK_NULL_RETURN(string_class, NULL);
     String_init_ID =
         (*env)->GetMethodID(env, string_class, "<init>", "([B)V");
-    CHECK_NULL_RETURN(String_init_ID);
+    CHECK_NULL_RETURN(String_init_ID, NULL);
     blockA = (jbyte *) GetEnvironmentStringsA();
     if (blockA == NULL) {
         /* Both GetEnvironmentStringsW and GetEnvironmentStringsA

regards,
Sean.