[nrf fromlist] samples: drivers: mbox: Allow coverage calculation

The sample must end to dump coverage data.
Stop receiving to prevent callback from interrupting coverage dump.

Upstream PR: zephyrproject-rtos/zephyr#76415

Signed-off-by: Piotr Kosycarz <[email protected]>

Author: nordic-piks

samples/drivers/mbox/src/main.c

@@ -46,7 +46,11 @@ int main(void)
 	printk("Maximum bytes of data in the TX message: %d\n", mbox_mtu_get_dt(&tx_channel));
 	printk("Maximum TX channels: %d\n", mbox_max_channels_get_dt(&tx_channel));
 
+#ifndef CONFIG_COVERAGE
 	while (1) {
+#else
+	for (int i = 0; i < 5; i++) {
+#endif
 #if defined(CONFIG_MULTITHREADING)
 		k_sleep(K_MSEC(2000));
 #else
@@ -62,5 +66,13 @@ int main(void)
 		}
 	}
 #endif /* CONFIG_TX_ENABLED */
+
+#ifdef CONFIG_RX_ENABLED
+	ret = mbox_set_enabled_dt(&rx_channel, false);
+	if (ret < 0) {
+		printk("Could not disable RX channel %d (%d)\n", rx_channel.channel_id, ret);
+		return 0;
+	}
+#endif /* CONFIG_RX_ENABLED */
 	return 0;
 }