crypto: hisilicon - Fix sscanf format signedness

The function qm_qos_value_init expects an unsigned integer but
is incorrectly supplying a signed format to sscanf.  This patch
fixes it.
Reported-by: Nkernel test robot <lkp@intel.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/hisilicon/qm.c

@@ -4185,7 +4185,7 @@ static ssize_t qm_qos_value_init(const char *buf, unsigned long *val)
 			return -EINVAL;
 	}
 
-	ret = sscanf(buf, "%ld", val);
+	ret = sscanf(buf, "%lu", val);
 	if (ret != QM_QOS_VAL_NUM)
 		return -EINVAL;