staging: gdm72xx: cancel work when driver unloads
staging: gdm72xx: cancel work when driver unloads

cancel the work function at driver unload stage and remove
the function from the queue

Cc: Ben Chan <cbf05950e17ecad3ef3493de163419467bf3e151@chromium.org>
Signed-off-by: Devendra Naga <97fdf9fb34d40445b99f4e064a18057cd6e2bccb@gmail.com>
Signed-off-by: Greg Kroah-Hartman <4645f7897fd33786a2ee1264d590b3c400559d85@linuxfoundation.org>

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