* calling receive_data with NULL as first argument(thread_id)

failed on Haiku, this makes e.g. painting in ArtPaint work

  Don't know if this is the best place to fix it though.



git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@27322 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/system/libroot/os/thread.c

@@ -179,6 +179,10 @@ send_data(thread_id thread, int32 code, const void *buffer, size_t bufferSize)
 int32
 receive_data(thread_id *_sender, void *buffer, size_t bufferSize)
 {
+	if (_sender == NULL) {
+		thread_id id;
+		return _kern_receive_data(&id, buffer, bufferSize);
+	}
 	return _kern_receive_data(_sender, buffer, bufferSize);
 }