Fix compilation error on some arches after r336761.

A cast for printing an intmax_t was needed in a kqueue test for some
arches.

MFC after:	1 week
X-MFC-with:	r336761
Sponsored by:	Dell EMC

tests/sys/kqueue/libkqueue/timer.c

@@ -239,7 +239,7 @@ test_abstime(void)
     kev.fflags = 0;
     kevent_cmp(&kev, kevent_get(kqfd));
     if (time(NULL) < when + timeout)
-	err(1, "too early %jd %jd", time(NULL), when + timeout);
+    	err(1, "too early %jd %jd", time(NULL), (intmax_t)(when + timeout));
 
     /* Check if the event occurs again */
     sleep(3);