modprobe: fix params with multi-line descriptions

The command `modprobe -p nouveau` outputs:

    tv_norm:Default TV norm.
    		Supported: PAL, PAL-M, PAL-N, PAL-Nc, NTSC-M, NTSC-J,
    			hd480i, hd480p, hd576i, hd576p, hd720p, hd1080i.
    		Default: PAL
    		*NOTE* Ignored for cards with external TV encoders. (charp)
    tv_disable:Disable TV-out detection (int)
    ...

This breaks module parameter auto-completion, so only suggest parameters
which are not preceded by whitespace. Tested with kmod 17-1 on Arch
Linux.

Modified-By: Ville Skyttä <ville.skytta@iki.fi>
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