radio: iris: Add NULL pointer check

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

Conflicts:
        drivers/media/radio/radio-iris.c

Change-Id: Ic3368d619d23c76702d95e0f69e41394e423a296
CRs-Fixed: 548404
Signed-off-by: Ayaz Ahmad <aahmad@codeaurora.org>
radio: iris: Fixed an issue with search stations list.

RDS search, search station list were getting excluded
while checking bounds for allowed search types. Fixed
check to include them.

CRs-fixed: 597996
Change-Id: Ia2d7cc8a1bbf8e861a0e23dfc8ca56181b42b810
Signed-off-by: Satish Kodishala <skodisha@codeaurora.org>

Conflicts:
	include/media/radio-iris.h