os: Ignore dying client in ResetCurrentRequest
You might as well, it's harmless. Better, some cleanup code (like DRI2 swap wait) needs to run both normally and at client exit, so it simplifies the callers to not need to check first. See 4308f5d3 for a similar example.
Props: @ajax (Adam Jackson)
Fixes: #211 (closed)
Signed-off-by: Daniel Llewellyn email@example.com