Print struct timeval consistently

Use print_struct_timeval interface to print struct timeval.

* print_timeval.c (print_struct_timeval): New mpers printer.
* print_timex.c (print_timex): Use it.
* printrusage.c (printrusage): Likewise.
* v4l2.c (print_v4l2_buffer): Likewise.
* tests/getrusage.c (main): Print tv_sec and tv_usec fields as signed.
* tests/waitid.c (sprint_rusage): Likewise.

Suggested-by: Eugene Syromyatnikov <evgsyr@gmail.com>

print_timeval.c

@@ -41,6 +41,11 @@ print_timeval_t(const timeval_t *t)
 	tprintf(timeval_fmt, (intmax_t) t->tv_sec, (intmax_t) t->tv_usec);
 }
 
+MPERS_PRINTER_DECL(void, print_struct_timeval, const void *arg)
+{
+	print_timeval_t(arg);
+}
+
 MPERS_PRINTER_DECL(void, print_timeval,
 		   struct tcb *tcp, const long addr)
 {