input: atmel_mxt_ts: Add NULL pointer check
input: atmel_mxt_ts: Add NULL pointer check

Add null pointer exception check for pointer 'fw'
which may be NULL after request_firmware() call
and may be deferenced.

Change-Id: Ie4b4bb8548eb89b01f7f688372d8b0300542f72a
Signed-off-by: Himanshu Aggarwal <c89b95876334d0058ed881d3c17be63166d6ed55@codeaurora.org>

TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas