staging: wlan-ng: small cleanup in plugimage()

It's cleaner to set "j = -1;" before the if block and remove the else
statement.

Signed-off-by: Archana <craechal@gmail.com>
Reviewed-by: Dan Carpenter <error27@gmail.com>
Link: https://lore.kernel.org/r/20230311121253.10225-2-craechal@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>