crypto: qat - remove unnecessary list iteration

There's no need to iterate through the list for instances in the
accel_table since the number of devices is already known in this file.

Signed-off-by: Bruce Allan <bruce.w.allan@intel.com>
Signed-off-by: Tadeusz Struk <tadeusz.struk@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/qat/qat_common/adf_dev_mgr.c

@@ -182,12 +182,7 @@ int adf_devmgr_verify_id(uint32_t id)
 
 void adf_devmgr_get_num_dev(uint32_t *num)
 {
-	struct list_head *itr;
-
-	*num = 0;
-	list_for_each(itr, &accel_table) {
-		(*num)++;
-	}
+	*num = num_devices;
 }
 
 int adf_dev_in_use(struct adf_accel_dev *accel_dev)