Fix a check in the objc trampoline handler

Summary:
The function FunctionCaller::WriteFunctionArguments returns false on
errors, so they should check for the false return value.

Change by Walter Erquinigo <a20012251@gmail.com>

Reviewers: jingham, clayborg

Subscribers: lldb-commits

Differential Revision: http://reviews.llvm.org/D22278

llvm-svn: 275287

lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCTrampolineHandler.cpp

@@ -818,7 +818,7 @@ AppleObjCTrampolineHandler::SetupDispatchFunction(Thread &thread, ValueList &dis
     // if other threads were calling into here, but actually it isn't because we allocate a new args structure for
     // this call by passing args_addr = LLDB_INVALID_ADDRESS...
 
-    if (impl_function_caller->WriteFunctionArguments(exe_ctx, args_addr, dispatch_values, diagnostics))
+    if (!impl_function_caller->WriteFunctionArguments(exe_ctx, args_addr, dispatch_values, diagnostics))
     {
         if (log)
         {