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drm_hwcomposer: vsyncworker: Fix deadlock on exit path

Alexandru Gheorghe requested to merge alex_g1/drm-hwcomposer:fix_vsyncworker_deadlock into master

vsyncworker::Routine assumes that when -EINTR is returned by WaitForSignalOrExitLocked the lock as been released, which is not true, so it hangs if a vsyncworker is never enabled and Exit is called.

Fixed by releasing lock in vsynworker::Routine on all code paths.

Signed-off-by: Alexandru Gheorghe alexandru-cosmin.gheorghe@arm.com

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