crypto: qce - fix error return code in qce_skcipher_async_req_handle()

Fix to return a negative error code from the error handling
case instead of 0, as done elsewhere in this function.

Fixes: 1339a7c3 ("crypto: qce: skcipher: Fix incorrect sg count for dma transfers")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Reviewed-by: Thara Gopinath <thara.gopinath@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>