One of the early return cases missed the mutex unlocking. Hilarity
ensued.

This regression has been introduced in

commit 7b24056b
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date:   Wed Dec 12 00:35:33 2012 +0100

    drm: don't hold crtc mutexes for connector ->detect callbacks

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=59750Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
Tested-by: NCancan Feng <cancan.feng@intel.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>