link: Protect registration of af and link ops with rwlock
link: Protect registration of af and link ops with rwlock

Signed-off-by: Thomas Graf <17c2d8920621522552b392f72d8fdb4d1e866b44@suug.ch>

baloo/libnl,cyclops8456/libnl3,chitranshi/libnl,chitranshi/libnl,mshirley/libnl,houstar/libnl,tklauser/libnl,tklauser/libnl,houstar/libnl,tklauser/libnl,baloo/libnl,teto/libnl_old,claudelee/libnl,HolyShitMan/libnl-1,kolyshkin/libnl,mshirley/libnl,mshirley/libnl,Distrotech/libnl,congwang/libnl,teto/libnl_old,baloo/libnl,greearb/libnl-ct,honsys/libnl,houstar/libnl,karlhiramoto/libnl,houstar/libnl,Distrotech/libnl,chitranshi/libnl,Distrotech/libnl,vyos/libnl3,dsahern/libnl,teto/libnl_old,honsys/libnl,tgraf/libnl,dsahern/libnl,kolyshkin/libnl,tklauser/libnl,congwang/libnl,tgraf/libnl,tgraf/libnl,honsys/libnl,cyclops8456/libnl3,kolyshkin/libnl,honsys/libnl,baloo/libnl,cfriedt/libnl,vyos/libnl3,cfriedt/libnl,cfriedt/libnl,karlhiramoto/libnl,HolyShitMan/libnl-1,tgraf/libnl,dsahern/libnl,HolyShitMan/libnl-1,cfriedt/libnl,UnicronNL/libnl3,cyclops8456/libnl3,chitranshi/libnl,dsahern/libnl,vyos/libnl3,congwang/libnl,claudelee/libnl,mshirley/libnl,karlhiramoto/libnl,thom311/libnl,thom311/libnl,Distrotech/libnl,UnicronNL/libnl3,UnicronNL/libnl3,karlhiramoto/libnl,claudelee/libnl,greearb/libnl-ct,greearb/libnl-ct,congwang/libnl,thom311/libnl,kolyshkin/libnl,UnicronNL/libnl3,cyclops8456/libnl3,teto/libnl_old,vyos/libnl3,HolyShitMan/libnl-1,claudelee/libnl