nl_recv: return NLE_INVAL if buf is NULL
nl_recv: return NLE_INVAL if buf is NULL

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