Fix pathtrace match for pipe2 syscall
Fix pathtrace match for pipe2 syscall

* pathtrace.c (pathtrace_match): As pipe2 syscall has no descriptors
or paths to test, move SEN_pipe2 to the appropriate category.

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