hostapd: add missing return statement

Avoids crash due to uninitialized stack/register garbage

Signed-off-by: Felix Fietkau <[email protected]>

package/network/services/hostapd/src/src/ap/ucode.c

@@ -396,6 +396,8 @@ uc_hostapd_iface_stop(uc_vm_t *vm, size_t nargs)
 		hostapd_drv_stop_ap(hapd);
 		hapd->beacon_set_done = 0;
 	}
+
+	return NULL;
 }
 
 static uc_value_t *