wusb: Remove unnecessary static function ckhdid_printf

This static inline is unnecessary and can be removed
by using the vsprintf %ph extension.

This reduces overall object size by more than 2K.

Reported-by: Louis Taylor <louis@kragniz.eu>
Signed-off-by: Joe Perches <joe@perches.com>
Reviewed-by: Louis Taylor <louis@kragniz.eu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>