nfc: s3fwrn5: fix undefined parameter values in dev_err()

In the function s3fwrn5_fw_download(), the 'ret' is not assigned,
so the correct value should be given in dev_err function.

Fixes: a0302ff5

 ("nfc: s3fwrn5: remove unnecessary label")
Signed-off-by: Zhang Shengju <zhangshengju@cmss.chinamobile.com>
Signed-off-by: Tang Bin <tangbin@cmss.chinamobile.com>
Signed-off-by: David S. Miller <davem@davemloft.net>