hostapd: Don't chown control interface to root

If ctrl_interface_group in the config file is set hostapd tries to
chown the dir and socket to uid 0. This causes the chown to fail
if hostapd is run as non-root.

Signed-hostap: Pontus Fuchs <pontus.fuchs@gmail.com>

hostapd/ctrl_iface.c

@@ -997,7 +997,7 @@ int hostapd_ctrl_iface_init(struct hostapd_data *hapd)
 	}
 
 	if (hapd->conf->ctrl_interface_gid_set &&
-	    chown(hapd->conf->ctrl_interface, 0,
+	    chown(hapd->conf->ctrl_interface, -1,
 		  hapd->conf->ctrl_interface_gid) < 0) {
 		perror("chown[ctrl_interface]");
 		return -1;
@@ -1055,7 +1055,7 @@ int hostapd_ctrl_iface_init(struct hostapd_data *hapd)
 	}
 
 	if (hapd->conf->ctrl_interface_gid_set &&
-	    chown(fname, 0, hapd->conf->ctrl_interface_gid) < 0) {
+	    chown(fname, -1, hapd->conf->ctrl_interface_gid) < 0) {
 		perror("chown[ctrl_interface/ifname]");
 		goto fail;
 	}