sd-event: don't destroy inotify data structures from inotify event handler

sd-event: don't destroy inotify data structures from inotify event handler

This fixes a bad memory access when we destroy an inotify source handler
from the handler itself, and thus destroy the associated inotify_data
structures.

Fixes: #20177
(cherry picked from commit 53baf2efa420cab6c4b1904c9a0c46a0c4ec80a1)
(cherry picked from commit 439a271943aa182002e5fb64f1a216415e556472)