Remove duplicated Hewlett Packard entry

Signed-off-by: Richard Hughes <richard@hughsie.com>
Goldstar should be LG (Lucky and Goldstar merged in 1995, see http://en.wikipedia.org/wiki/GoldStar)

Signed-off-by: Richard Hughes <richard@hughsie.com>
Fix typo: Liyama should be Iiyama

Signed-off-by: Richard Hughes <richard@hughsie.com>
Fix creation of the dummy sensor device

We were checking the local variable before it had been set.
Show a warning for incorrect or extra command line arguments