tests/statfs.c: use libtests
tests/statfs.c: use libtests

* tests/statfs.c (main): Use perror_msg_and_fail.

cuviper/strace,Saruta/strace,Saruta/strace,cuviper/strace,Saruta/strace,cuviper/strace,Saruta/strace,cuviper/strace,cuviper/strace,Saruta/strace