Remove write-only variables in lib/cache.c
Remove write-only variables in lib/cache.c

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