tests/ftruncate64.c: cleanup
tests/ftruncate64.c: cleanup

* tests/ftruncate64.c (main): Use errno2name, stop using assert.

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