mqueue: Convert message queue timeout to use hrtimers

mqueue: Convert message queue timeout to use hrtimers

The message queue functions mq_timedsend() and mq_timedreceive()
have not yet been converted to use the hrtimer interface.

This patch replaces the call to schedule_timeout() by a call to
schedule_hrtimeout() and transforms the expiration time from
timespec to ktime as required.

[ tglx: Fixed whitespace wreckage ]

Signed-off-by: Carsten Emde <[email protected]>
Tested-by: Pradyumna Sampath <[email protected]>
Cc: Arjan van de Veen <[email protected]>
Cc: Andrew Morton <[email protected]>
LKML-Reference: <20100402204331.715783034@osadl.org>
Signed-off-by: Thomas Gleixner <[email protected]>