missing wait_event_timeout

[Steve French]

Is there a reason why there is no wait_event_timeout function in kernel.
There is only the __wait_event_timeout_interruptible in wait.h
It seems the easiest way to fix the few remaining pieces of code which
call the deprecated sleep_on_timeout.

ie something like:


> #define __wait_event_timeout(wq, condition, ret)
> do {			
> 	DEFINE_WAIT(__wait);	
> 				
> 	for (;;) {		
> 		prepare_to_wait(&wq, &__wait, TASK_UNINTERRUPTIBLE);
> 		if (condition)				
> 			break;				
> 		ret = schedule_timeout(ret);	
> 		if (!ret)			
> 			break;			
> 	}						
> 	finish_wait(&wq, &__wait);					
> } while (0)



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