FreeBSD/src d714378 (r349966)sys/dev/netmap netmap_generic.c

netmap: fix bug introduced by r349752

r349752 introduced a NULL pointer reference bug
in the emulated netmap code.

Reported by:    lwhsu
MFC after:      3 days
DeltaFile
+2-1sys/dev/netmap/netmap_generic.c
+2-11 files

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