msm: smp2p: fix potential uninitialized variable access

From code inspection, there is a possibility of using variables that
have not been initialized in certain failure scenarios.

Initialize variables to default known values in case the error
conditions are hit.

CRs-Fixed: 505235
Change-Id: I85fbb872573326c853be1f6a7a9a1a62f5636ca1
Signed-off-by: Eric Holmberg <eholmber@codeaurora.org>