depmod: fix checking file extension

depmod: fix checking file extension

In depfile_up_to_date_dir() we need to check if name has a kmod
extension. "path" variable there will be the directory name, which
doesn't contain an extension.

Without this, "depmod -A" returns that the modules.dep is up to date,
even if it isn't.

In depmod_modules_search_file() it's pointless to compare the basename,
so pass only the name to be checked.