msm: ipa: add check to see if pm client is not NULL

Add check to see if it is freed in pm deregister context
and trying to read again after free.

Change-Id: I764f012d0c7cd53f126aee221f7c1d6a914b7390
Signed-off-by: Michael Adisumarta <madisuma@codeaurora.org>
1 file changed