tests: fix warning on unused var in test_skipdata.c
tests: fix warning on unused var in test_skipdata.c

bSr43/capstone,AmesianX/capstone,AmesianX/capstone,AmesianX/capstone,bSr43/capstone,AmesianX/capstone,bSr43/capstone,AmesianX/capstone,bSr43/capstone,bSr43/capstone,AmesianX/capstone,bSr43/capstone,AmesianX/capstone,bSr43/capstone