SA9001: false positive in presence of control flow statements

[dominikh]

Neither of these defers should get flagged:

package pkg

func fn() {
	var ch chan int
	for range ch {
		defer println()
		break
	}

	for range ch {
		defer println()
		return
	}
}

But they do get flagged:

/tmp/foo.go:6:3: defers in this range loop won't run unless the channel gets closed (SA9001)
/tmp/foo.go:11:3: defers in this range loop won't run unless the channel gets closed (SA9001)