[PATCH] modprobe -q: quieter when modules missing

[PATCH] modprobe -q: quieter when modules missing

The kernel invokes "modprobe" on modules which might not exist:
rightfully, modprobe complains by default when this happens.  So the
correct response is to invoke "modprobe -q", which is silent on such
errors (but still reports other errors such as config errors).

Also, use MODULE_NAME_LEN from module.h instead of inventing our own.