Test fix for node 0.8 failing.

This was suggested by someone. Just checking it out.

src/robotjs.cc

@@ -734,17 +734,17 @@ class BMP
 //Convert object from Javascript to a C++ class (BMP).
 BMP buildBMP(Local<Object> info) 
 {
-	Local<Object> obj = Nan::To<v8::Object>(info).ToLocalChecked();
-
+	char * buf = NULL;
 	BMP img;
+	Local<Object> obj = Nan::To<v8::Object>(info).ToLocalChecked();
 
 	img.width = obj->Get(Nan::New("width").ToLocalChecked())->Uint32Value();
 	img.height = obj->Get(Nan::New("height").ToLocalChecked())->Uint32Value();
 	img.byteWidth = obj->Get(Nan::New("byteWidth").ToLocalChecked())->Uint32Value();
 	img.bitsPerPixel = obj->Get(Nan::New("bitsPerPixel").ToLocalChecked())->Uint32Value();
 	img.bytesPerPixel = obj->Get(Nan::New("bytesPerPixel").ToLocalChecked())->Uint32Value();
 
-	char* buf = node::Buffer::Data(obj->Get(Nan::New("image").ToLocalChecked()));
+	buf = node::Buffer::Data(obj->Get(Nan::New("image").ToLocalChecked()));
 
 	//Convert the buffer to a uint8_t which createMMBitmap requires. 
 	img.image = (uint8_t *)malloc(img.byteWidth * img.height);