It's not necessary to free memory allocated with devm_kzalloc
and using kfree leads to a double free.

Fixes: d776fc86 ("wlcore: sdio: Populate config firmware data")
Signed-off-by: NWei Yongjun <weiyongjun1@huawei.com>
Acked-by: NTony Lindgren <tony@atomide.com>
Signed-off-by: NKalle Valo <kvalo@codeaurora.org>