drm/tegra: Fix lockup on a use of staging API

drm/tegra: Fix lockup on a use of staging API

Commit bdd2f9cd10eb ("Don't leak kernel pointer to userspace") added a
mutex around staging IOCTL's, some of those mutexes are taken twice.

Fixes: bdd2f9cd10eb ("drm/tegra: Don't leak kernel pointer to userspace")
Signed-off-by: Dmitry Osipenko <[email protected]>
Reviewed-by: Mikko Perttunen <[email protected]>
Reviewed-by: Erik Faye-Lund <[email protected]>
Signed-off-by: Thierry Reding <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/7b70a506a9d2355ea6ff19a8c4f4d726b67719b3.1497480754.git.digetx@gmail.com