We were not pausing after detecting the response was pending and so did
not allow the hardware sufficient time to complete before aborting. This
lead to transient failures whilst probing SDVO devices.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=30235Reported-by: NKnut Petersen <Knut_Petersen@t-online.de>
Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>