The return value from devm_memremap() is not checked correctly.
The test is done against a wrong variable. This patch fix it.

Fixes: ba94c753 ("ath10k: add QMI message handshake for wcn3990 client")
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>