cache: fix crash in nl_cache_dump_filter() when omitting the params argument
cache: fix crash in nl_cache_dump_filter() when omitting the params argument

Error found by coverity.

Acked-by: Thomas Graf <17c2d8920621522552b392f72d8fdb4d1e866b44@suug.ch>
Signed-off-by: Thomas Haller <16e26612e4159990a6b3691e92592e691ff74132@redhat.com>

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