msm: ipa: Fix compiler warnings

Fix a few compiler warnings including an uninitalized variable and
several string format warnings.

Fixes: 859783a1 ("msm: ipa: Add snapshot of IPA driver")
Change-Id: Ic0dedbad9c36c58625d35f48cf49a983155e3729
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>