Actually copy the data to be written into the message.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@39848 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/kits/debug/debug_support.cpp

@@ -235,6 +235,7 @@ debug_write_memory_partial(debug_context *context, const void *address,
 	message.reply_port = context->reply_port;
 	message.address = (void*)address;
 	message.size = size;
+	memcpy(message.data, buffer, size);
 
 	// send the message
 	debug_nub_write_memory_reply reply;