Add the missing check for NULL pointer before use it.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@10140 6f19259b-4bc3-4df7-8a09-765794883524

EdkCompatibilityPkg/Compatibility/FrameworkHiiOnUefiHiiThunk/UefiIfrParser.c

@@ -621,6 +621,7 @@ ParseOpCodes (
       // Create a new Form Map for this FormSet
       //
       CurrentForm = AllocateZeroPool (sizeof (FORM_BROWSER_FORM));
+      ASSERT (CurrentForm != NULL);
       CurrentForm->Signature = FORM_BROWSER_FORM_SIGNATURE;
 
       InitializeListHead (&CurrentForm->StatementListHead);