This fixes the following warning:
```
[ 5.628796] TEST-13-NSPAWN.sh[299]: + importctl import-raw --class=confext /var/tmp/importtest
(snip)
[ 5.638894] systemd-importd[302]: (transfer1) Operation completed successfully.
[ 5.640760] TEST-13-NSPAWN.sh[318]: ^MTotal: 0%^MTotal: 40%
[ 5.638902] systemd-importd[302]: (transfer1) Exiting.
[ 5.638931] systemd-importd[302]: Got percentage from client: 40%
[ 5.638956] systemd-importd[302]: Transfer process succeeded.
[ 5.638988] systemd-importd[302]: Got notification datagram from unexpected peer, ignoring.
```
r = notify_socket_prepare(
m->event,
- SD_EVENT_PRIORITY_NORMAL,
+ SD_EVENT_PRIORITY_NORMAL - 1, /* Make this processed before SIGCHLD. */
manager_on_notify,
m,
&m->notify_socket_path);
r = notify_socket_prepare(
m->event,
- SD_EVENT_PRIORITY_NORMAL,
+ SD_EVENT_PRIORITY_NORMAL - 1, /* Make this processed before SIGCHLD. */
manager_on_notify,
m,
&m->notify_socket_path);