vol: Remove unneeded braces

vol: Remove unneeded 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 vol to make clang happy.

Change-Id: I805c52fd76de4d028741ae4382b747917581d2f2
Reviewed-on: http://gerrit.openafs.org/7082
Reviewed-by: Derrick Brashear <shadow@dementix.org>
Tested-by: Derrick Brashear <shadow@dementix.org>