msm: msm_bus: Add braces around suspiciously indented code

The code here is indented, but the braces are missing for a
multi-statement if branch. Add the braces so that it doesn't look
confusing and also so that newer compilers don't complain about
missing braces. Code functionally should be the same.

Change-Id: I460e7c095a3cd95fd9576fd2613cf7a498837095
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>