Update: examples/graceful-shutdown/graceful-shutdown/server.go (gin-g…

…onic#9)

Because staticcheck pointed out the following:
- SA1017 https://staticcheck.io/docs/checks#SA1017
- S1000 https://staticcheck.io/docs/checks#S1000

graceful-shutdown/graceful-shutdown/server.go

@@ -35,7 +35,7 @@ func main() {
 
  // Wait for interrupt signal to gracefully shutdown the server with
  // a timeout of 5 seconds.
- quit := make(chan os.Signal)
+ quit := make(chan os.Signal, 1)
  // kill (no param) default send syscanll.SIGTERM
  // kill -2 is syscall.SIGINT
  // kill -9 is syscall. SIGKILL but can"t be catch, so don't need add it
@@ -49,9 +49,8 @@ func main() {
  log.Fatal("Server Shutdown:", err)
  }
  // catching ctx.Done(). timeout of 5 seconds.
- select {
- case <-ctx.Done():
- log.Println("timeout of 5 seconds.")
- }
+ <-ctx.Done()
+ log.Println("timeout of 5 seconds.")
+
  log.Println("Server exiting")
 }