depmod: Rename variable to clarify its meaning
depmod: Rename variable to clarify its meaning

In mod->modnamelen we were actually including the '\0', i.e.
strlen(modname) + 1. So rename it to modnamesz and add a comment in
depmod_module_is_higher_priority() to notice why it's correct since the
new one is really using strlen(modname).

pmmccorm/kmod,Distrotech/kmod,lpereira/kmod,lucasdemarchi/kmod,lucasdemarchi/kmod,Distrotech/kmod,pmmccorm/kmod,lpereira/kmod,lucasdemarchi/kmod,lpereira/kmod,pmmccorm/kmod,Distrotech/kmod