Returning PTR_ERR(NULL) means success, but we should return -ENOMEM.
Fixes: 1399fb87ea3e ("ath11k: register MHI controller device for QCA6390") Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Kalle Valo <kvalo@codeaurora.org> Link: https://lore.kernel.org/r/20200826113417.GE393664@mwanda