All other calls to pfxlist_onlink_check() are protected by splsoftnet. Put an splsoftnet() around the call to pfxlist_onlink_check() in in6_control(SIOCAIFADDR_IN6).  Include the call to dohooks() in the protection like it is done elsewhere. splassert failure reported and fix tested by matthieu@;  OK mikeb@
All other calls to pfxlist_onlink_check() are protected by splsoftnet.
Put an splsoftnet() around the call to pfxlist_onlink_check() in
in6_control(SIOCAIFADDR_IN6).  Include the call to dohooks() in the
protection like it is done elsewhere.
splassert failure reported and fix tested by matthieu@;  OK mikeb@

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars