msm: pcie: Fix lots of static checker errors

This file has so many sparse warnings that sparse fails with an
error message about too many warnings. Fix them all so that we
can find future sparse errors in this file.

Change-Id: I719153ff680627e2e6b3a326085239acd7fcf0a0
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>