radio: iris: Avoid NULL pointer dereferencing

Before dereferencing a pointer check for NULL
pointer.

CRs-Fixed: 537890
Signed-off-by: Ayaz Ahmad <aahmad@codeaurora.org>
Change-Id: If010b89fd4f5930d944c9e327c51de4b40f33c3c
radio: iris: Avoid inconsistent free

There is memory leak chance if we exit
from function early. Ensure to use free before
exiting from function.

Change-Id: I17dbecffc5713d95c66ecec0bffb5ed3c8660fe8
CRs-Fixed: 540334
Signed-off-by: Ayaz Ahmad <aahmad@codeaurora.org>