iwlwifi: mvm: unregister leds when registration failed

commit b7327d89ae694a89f9934d428bde520b77b3131c upstream.

This was missing and prevented any further attempts
to load the module.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>