#13 Improve "const correctness"

[Markus Elfring]

Would you like to apply the advices from the article
"http://en.wikipedia.org/wiki/Const_correctness" to
your sources?
I suggest to add the key word "const" to the type
specifiers of parameters like "n" for the function
"names_init" and "head" for the function "list_empty".
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http://cvs.sourceforge.net/viewcvs.py/linux-usb/usbutils/list.h?rev=1.1.1.1&view=markup
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http://cvs.sourceforge.net/viewcvs.py/linux-usb/usbutils/names.c?rev=1.2&view=markup