NetBSD/src FjMpO4ysys/net if.c, tests/net/if t_ifconfig.sh

   Pull up following revision(s) (requested by ozaki-r in ticket #1339):

        sys/net/if.c: revision 1.458
        tests/net/if/t_ifconfig.sh: revision 1.21

   Restore if_ioctl on error of ifc_destroy

   Otherwise subsequence ioctls won't work.

   Patch from Harold Gutch on PR kern/54434 (tweaked a bit by me)
   tests: check if ifconfig (ioctl) works after a failure of ifconfig destroy

   This is a test for PR kern/54434.
VersionDeltaFile
1.394.2.17+15-3sys/net/if.c
1.18.4.1+6-1tests/net/if/t_ifconfig.sh
+21-42 files

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