fix(e2e): check the realtime-failover websocket close result

errcheck flagged tests/e2e/realtime_ws_test.go:307 as new on this branch
(the localai-proxy realtime failover spec) once the e2e lint scope widened.
Same house style the maintainer bot used for the other close results in
this file (19f6a18b8): wrap in a deferred closure so the error is explicitly
discarded rather than silently ignored.

Assisted-by: Claude:claude-opus-5-5
Signed-off-by: Ettore Di Giacinto <mudler@localai.io>

tests/e2e/realtime_ws_test.go

@@ -304,7 +304,7 @@ var _ = Describe("Realtime WebSocket API", Label("Realtime"), func() {
 				Should(Equal("lp-rt-llm"))
 
 			conn := connectWS("rt-lp")
-			defer conn.Close()
+			defer func() { _ = conn.Close() }()
 
 			Expect(readServerEvent(conn, 30*time.Second)["type"]).To(Equal("session.created"))
 			initial := drainUntil(conn, "localai.model.failover", 10*time.Second)