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read.go: Avoid handling ping after close frame has been sent

Closes#298

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Original file line number	Diff line number	Diff line change
`@@ -286,6 +286,13 @@ func (c *Conn) handleControl(ctx context.Context, h header) (err error) {`
`286`	`286`
`287`	`287`	`switchh.opcode {`
`288`	`288`	`caseopPing:`
	`289`	`+c.closeMu.Lock()`
	`290`	`+wroteClose:=c.wroteClose`
	`291`	`+c.closeMu.Unlock()`
	`292`	`+ifwroteClose {`
	`293`	`+// Cannot respond to ping with a pong because we already sent a close frame.`
	`294`	`+returnnil`
	`295`	`+}`
`289`	`296`	`returnc.writeControl(ctx,opPong,b)`
`290`	`297`	`caseopPong:`
`291`	`298`	`c.activePingsMu.Lock()`

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