[nrf fromlist] modules: hostap: Fix double free of the event

When an event is sent the receiver gets is asynchronously and hence is
responsible for free the event, the sender should only free in case of
error conditions i.e., unable to send.

Else, this causes a tough to debug double-free.

Upstream PR: zephyrproject-rtos/zephyr#79231

Signed-off-by: Chaitanya Tata <[email protected]>

Author: krish2718

modules/hostap/src/supp_main.c

@@ -436,6 +436,8 @@ static int del_interface(struct supplicant_context *ctx, struct net_if *iface)
 
 	supplicant_generate_state_event(ifname, NET_EVENT_SUPPLICANT_CMD_IFACE_REMOVED, 0);
 
+	return 0;
+
 out:
 	if (event) {
 		os_free(event);