OPNSense/src 0a8fd4fsys/dev/netmap netmap_monitor.c

MFC r343413

netmap: fix crash with monitors and VALE ports

Crash report described here:
    https://github.com/luigirizzo/netmap/issues/583
Fixed by providing dummy sync callback in case it is missing.
DeltaFile
+10-1sys/dev/netmap/netmap_monitor.c
+10-11 files

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