Unix CM: Purge needless brackets

Unix CM: Purge needless brackets

Doing if ((a==b)) is unecessary. It's also potentially dangerous, as
that's the syntax required to do assignment within an if statement.
clang now issues warnings (errors in -Werror mode) when it encounters
these.

Remove pointless braces from the Unix CM to make clang happy.

Change-Id: I0f1558b42a487e1de722b77f8423500365a20eee
Reviewed-on: http://gerrit.openafs.org/7074
Reviewed-by: Derrick Brashear <shadow@dementix.org>
Tested-by: Derrick Brashear <shadow@dementix.org>