style: improve DHCP + static IP warning

Co-authored-by: Panagiotis "Ivory" Vasilopoulos <[email protected]>

Author: mkroening

src/executor/device.rs

@@ -58,10 +58,9 @@ impl<'a> NetworkInterface<'a> {
 		#[cfg(feature = "trace")]
 		let mut device = Tracer::new(device, |timestamp, printer| trace!("{timestamp} {printer}"));
 
-		if hermit_var!("HERMIT_IP").is_some() {
-			warn!(
-				"A static IP address is specified with the environment variable HERMIT_IP, but the device is configured to use DHCPv4!"
-			);
+		if let Some(hermit_ip) = hermit_var!("HERMIT_IP") {
+			warn!("HERMIT_IP was set to {hermit_ip}, but Hermit was built with DHCPv4.");
+			warn!("Ignoring HERMIT_IP.");
 		}
 
 		let ethernet_addr = EthernetAddress([mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]]);