vmm: don't ignore errors from SIGWINCH listener

Now that the SIGWINCH listener has fallbacks for older kernels, we
don't expect it to routinely fail, so if there's an error setting it
up, we want to know about it.

Signed-off-by: Alyssa Ross <hi@alyssa.is>

vmm/src/device_manager.rs

@@ -1877,14 +1877,8 @@ impl DeviceManager {
         )
         .unwrap();
 
-        match start_sigwinch_listener(seccomp_filter, pty_sub) {
+        self.console_resize_pipe =
-            Ok(pipe) => {
+            Some(Arc::new(start_sigwinch_listener(seccomp_filter, pty_sub)?));
-                self.console_resize_pipe = Some(Arc::new(pipe));
-            }
-            Err(e) => {
-                warn!("Ignoring error from setting up SIGWINCH listener: {}", e)
-            }
-        }
 
         Ok(())
     }