fix: fix xunfei crash (#451)

controller/relay-text.go

@@ -315,12 +315,12 @@ func relayTextHelper(c *gin.Context, relayMode int) *OpenAIErrorWithStatusCode {
 			return errorWrapper(err, "close_request_body_failed", http.StatusInternalServerError)
 		}
 		isStream = isStream || strings.HasPrefix(resp.Header.Get("Content-Type"), "text/event-stream")
-	}
 
 		if resp.StatusCode != http.StatusOK {
 			return errorWrapper(
 				fmt.Errorf("bad status code: %d", resp.StatusCode), "bad_status_code", resp.StatusCode)
 		}
+	}
 
 	var textResponse TextResponse
 	tokenName := c.GetString("token_name")