unit_test.c: fix printf, remove unused parameter

Fix for:
[test/unit_test.c:827]: (warning) printf format string requires 0
 parameters but 1 is given.
[test/unit_test.c:833]: (warning) printf format string requires 0
 parameters but 1 is given.

Signed-off-by: Danny Al-Gaaf <danny.al-gaaf@bisect.de>