radio: iris: Add NULL pointer check
radio: iris: Add NULL pointer check

Dereferencing a NULL pointer may cause kernel crash,
Check for NULL pointer before dereferencing

Change-Id: I43b1aa8054646f29833f82b7203192aa3494d912
CRs-Fixed: 548404
Signed-off-by: Ayaz Ahmad <cd4d90a4e0b4b7abd2e2617b2a9d5903271a7aac@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