iwlwifi: fix double hyphen in MODULE_FIRMWARE for 8000

iwlwifi: fix double hyphen in MODULE_FIRMWARE for 8000

commit 7941c59e45f3b6d30e07375e9b6713427e0a9f98 upstream.

Mistakenly, the driver is trying to load the 8000C firmware with an
incorrect name (i.e. with two hyphens where there should be only one)
and that fails.  Fix that by removing the hyphen from the format
macro.

Fixes: e1ba684f762b ("iwlwifi: 8000: fix MODULE_FIRMWARE input")
Signed-off-by: Jürg Billeter <j@bitron.ch>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>