usbdump: remove some FreeBSD 9.x code

usr.sbin/usbdump/usbdump.c

@@ -792,23 +792,6 @@ usage(void)
 	exit(EX_USAGE);
 }
 
-static void
-check_usb_pf_sysctl(void)
-{
-	int error;
-	int no_pf_val = 0;
-	size_t no_pf_len = sizeof(int);
-
-	/* check "hw.usb.no_pf" sysctl for 8- and 9- stable */
-
-	error = sysctlbyname("hw.usb.no_pf", &no_pf_val,
-	    &no_pf_len, NULL, 0);
-	if (error == 0 && no_pf_val != 0) {
-		warnx("The USB packet filter might be disabled.");
-		warnx("See the \"hw.usb.no_pf\" sysctl for more information.");
-	}
-}
-
 int
 main(int argc, char *argv[])
 {
@@ -939,8 +922,6 @@ main(int argc, char *argv[])
 		exit(EXIT_SUCCESS);
 	}
 
-	check_usb_pf_sysctl();
-
 	p->fd = fd = open("/dev/bpf", O_RDONLY);
 	if (p->fd < 0)
 		err(EXIT_FAILURE, "Could not open BPF device");