Prepare for transition from xlookup64 to xlookup

* fcntl.c (print_fcntl, SYS_FUNC(fcntl), SYS_FUNC(fcntl64)):
Cast 2nd argument of xlookup to unsigned long.
* prctl.c (SYS_FUNC(prctl)): Likewise.
* sched.c (SYS_FUNC(sched_getscheduler)): Likewise.
* time.c (do_adjtimex): Likewise.
* ioprio.c (sprint_ioprio): Change type of the argument
and local variables from int to unsigned int.
* keyctl.c (print_keyring_serial_number): Cast 2nd argument
of xlookup to unsigned int.
* net.c (tprint_sock_type): Change type of the argument to unsigned int.
* printmode.c (sprintmode): Likewise.
* printsiginfo.c (printsigval):  Change type of si_code argument
to unsigned int.
diff --git a/sched.c b/sched.c
index e193498..bdf9707 100644
--- a/sched.c
+++ b/sched.c
@@ -39,7 +39,7 @@
 	if (entering(tcp)) {
 		tprintf("%d", (int) tcp->u_arg[0]);
 	} else if (!syserror(tcp)) {
-		tcp->auxstr = xlookup(schedulers, tcp->u_rval);
+		tcp->auxstr = xlookup(schedulers, (unsigned long) tcp->u_rval);
 		if (tcp->auxstr != NULL)
 			return RVAL_STR;
 	}