The kill(2) syscall returns ENOENT, not ESRCH on missing PIDs

Turns out the kill(2) syscall returns ENOENT, not ESRCH, in our test
suite.  Don't know why, the man page never mentions ENOENT, only the
ESRCH code.  Let's check for both, either way ithe PID is not there.

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

src/service.c

@@ -758,7 +758,7 @@ static int service_stop(svc_t *svc)
 			rc = kill(-svc->pid, svc->sighalt);
 			_d("kill(-%d, %d) => rc %d, errno %d", svc->pid, svc->sighalt, rc, errno);
 			/* PID lost or forking process never really started */
-			if (rc == -1 && errno == ESRCH) {
+			if (rc == -1 && (errno == ESRCH || errno == ENOENT)) {
 				service_cleanup(svc);
 				svc_set_state(svc, SVC_HALTED_STATE);
 			} else
@@ -836,7 +836,7 @@ static int service_restart(svc_t *svc)
 	logit(LOG_CONSOLE | LOG_NOTICE, "Restarting %s[%d], sending SIGHUP ...",
 	      svc_ident(svc, NULL, 0), svc->pid);
 	rc = kill(svc->pid, SIGHUP);
-	if (rc == -1 && errno == ESRCH) {
+	if (rc == -1 && (errno == ESRCH || errno == ENOENT)) {
 		/* nobody home, reset internal state machine */
 		lost = svc->pid;
 	} else {