libcamera: device_enumerator: Downgrade skipped device errors to warnings

When a device is skipped by the udev-based enumerator a message is
logged. Downgrade its severity to warning as the error isn't fatal.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>

src/libcamera/device_enumerator.cpp

@@ -302,8 +302,8 @@ int DeviceEnumeratorUdev::enumerate()
 
 		dev = udev_device_new_from_syspath(udev_, syspath);
 		if (!dev) {
-			LOG(Error) << "Failed to get device for '" <<
-				   syspath << "', skipping";
+			LOG(Warning) << "Failed to get device for '" <<
+				syspath << "', skipping";
 			continue;
 		}