[PATCH] server: Don't wait for low level hook result when queueing hardware message.

[Piotr Caban]

I'm attaching a simple application that may be used to observe the 
problem. The application creates a window and waits for WM_KEYDOWN 
message. It deadlocks without the patch. Unfortunately there's no way of 
testing it without the ability to generate non-injected hardware 
messages. I can add an interactive test if it's preferred.

Thanks,
Piotr
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