wil6210: fix a warning message condition

"iter" is -1 at the end of the loop and not zero.  It means we don't
print a warning message.

Change-Id: I532bd54fbdafb92e71205c317ae5d467c4cd5f3b
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
Git-commit: f94c48d6c315a580b60b062c0360561b61faa311
Git-repo: https://github.com/kvalo/ath.git


Signed-off-by: Maya Erez <merez@codeaurora.org>