qlcnic: Fix enviroment variable for udev event generation during FW dump

Driver was not generating the environment variable for the FW dump event correctly.
Fix it by formatting it properly.

Signed-off-by: Anirban Chakraborty <anirban.chakraborty@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>