staging: drm/omap: Validate debugfs device
staging: drm/omap: Validate debugfs device

Added check for valid device information before dumping debugfs
information.

Signed-off-by: Andy Gross <4ba87047449f5700e8758e3b1af36e94376c2fff@ti.com>
Signed-off-by: Rob Clark <7e09c9d3e96378bf549fc283fd6e1e5b7014cc33@ti.com>
Signed-off-by: Greg Kroah-Hartman <4645f7897fd33786a2ee1264d590b3c400559d85@linuxfoundation.org>

KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs