modprobe: don't stop on empty lines.

I don't _think_ that can happen with the .dep files since they're
machine-generated, but the config files can and do contain empty lines
to aid readability.

(Not found on Android, so I haven't tested this, but the code already
even contained a special case for empty lines. I haven't touched the
/proc/modules loop because the kernel definitely isn't going to insert
empty lines, and that code _would_ need to be modified to cope with
empty lines, and since I can't test this, that would be not just
pointless but also irresponsible!)

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