Use (void)var in logger for unused arguements
Use (void)var in logger for unused arguements

Use (void)var in the logger when WITH_DEFAULT_LOGGER is off
to make the unused variable warning go away.

Signed-off-by: Wendy Liang <cac46fad14f88489ab4dbc3c1082c7dafae20187@xilinx.com>

forg0ne/libmetal,forg0ne/libmetal