incusd/devices: Don't require a serial number for USB hotplug

Closes #1944

Signed-off-by: Stéphane Graber <[email protected]>

Author: stgraber

cmd/incusd/devices.go

@@ -150,11 +150,6 @@ func deviceNetlinkListener() (chan []string, chan device.USBEvent, chan device.U
 					continue
 				}
 
-				serial, ok := props["SERIAL"]
-				if !ok {
-					continue
-				}
-
 				major, ok := props["MAJOR"]
 				if !ok {
 					continue
@@ -192,7 +187,7 @@ func deviceNetlinkListener() (chan []string, chan device.USBEvent, chan device.U
 					 */
 					zeroPad(parts[0], 4),
 					zeroPad(parts[1], 4),
-					serial,
+					props["SERIAL"],
 					major,
 					minor,
 					busnum,