rx: Remove needless braces

rx: Remove needless braces

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: I031db80c3f85c0e4c4db365b1c36b5d4b4a7cb48
Reviewed-on: http://gerrit.openafs.org/7088
Tested-by: Simon Wilkinson <simonxwilkinson@gmail.com>
Reviewed-by: Derrick Brashear <shadow@dementix.org>