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

It is cleaner to use "goto free_result;" as is being followed
in rest of the implementation of writeimage function, and
remove unnecessary kfree statements.

Signed-off-by: Archana <craechal@gmail.com>
Reviewed-by: Dan Carpenter <error27@gmail.com>
Link: https://lore.kernel.org/r/20230311121253.10225-1-craechal@gmail.com


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