Fix definition of UNUSED(x)
Fix definition of UNUSED(x)

Make UNUSED(x) explicitly cast (x) to void. This fixes a number
of compiler warnings. UNUSED_DEBUG() is now identical to
UNUSED(), and could be removed in a future commit.

See also #188.

gonzoua/userland,adamheinrich/userland,raspberrypi/userland,maroviher/userland,maroviher/userland,gonzoua/userland,6by9/userland,raspberrypi/userland,6by9/userland,adamheinrich/userland,maroviher/userland,adamheinrich/userland,6by9/userland,kraj/userland,JamesH65/userland,kraj/userland,kraj/userland,JamesH65/userland,raspberrypi/userland,JamesH65/userland,gonzoua/userland