msm:ipa3 dereferencing Null pointer and casting error fixes

Resolved Null pointer dereferencing by adding check
on NULL pointer.
Resolved casting error by skipping the casting.

Added some header file to resolve implicit function
decation issue.

Change-Id: I69971e4e693adfaf6d5d3c2e5b9d9a6f4e18cf10
Signed-off-by: Rishabh Garg <rishgarg@codeaurora.org>