msm: smd: Update to current coding conventions and guidelines

Current coding conventions and guidelines indicate spaces and tabs should
not be intermixed, standard error code macros should be used where
appropiate, log strings should not be split onto multiple lines, and
single line if block bodies should not be wrapped in braces.

Update any non-conformant lines of code to the current coding conventions
and guidelines.

Change-Id: Iaeb6d1f351e5f763671bdda4bc3f576607ce654d
Signed-off-by: Jeffrey Hugo <jhugo@codeaurora.org>