FreeBSD/src 7f3eb9d (r343288)sys/net iflib.c

Fix various resource leaks that can occur in the error paths of
iflib_device_register() and iflib_pseudo_register().

Reviewed by:    shurd
MFC after:      1 week
Sponsored by:   RG Nets
Differential Revision:  https://reviews.freebsd.org/D18760
DeltaFile
+24-23sys/net/iflib.c
+24-231 files

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