Bug 577908 mark DEBUG only variables as ifdef DEBUG in nsCommandGroup.cpp

r=neil

embedding/components/commandhandler/src/nsCommandGroup.cpp

@@ -271,7 +271,10 @@ nsControllerCommandGroup::AddCommandToGroup(const char * aCommand, const char *a
   char* commandString = NS_strdup(aCommand); // we store allocated PRUnichar* in the array
   if (!commandString) return NS_ERROR_OUT_OF_MEMORY;
   
-  PRBool      appended = commandList->AppendElement(commandString) != nsnull;
+#ifdef DEBUG
+  char** appended =
+#endif
+    commandList->AppendElement(commandString);
   NS_ASSERTION(appended, "Append failed");
 
   return NS_OK;