msm: smd: Remove duplicate variable definitions

Remove duplicate local variable definitions that cause
variable aliasing and could result in accessing a null
pointer when dealing with open-close-open race
condition.

Change-Id: I74bfd6707215a1b241135f5a4dbfdb7453df6b93
Signed-off-by: Eric Holmberg <eholmber@codeaurora.org>