tty: serial: vt8500: fix return value check in vt8500_serial_probe()
In case of error, function of_clk_get() returns ERR_PTR() and never returns NULL. The NULL test in the return value check should be replaced with IS_ERR(). Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn> Acked-by: Tony Prisk <linux@prisktech.co.nz> Cc: stable <stable@vger.kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -604,7 +604,7 @@ static int vt8500_serial_probe(struct platform_device *pdev)
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vt8500_port->uart.flags = UPF_IOREMAP | UPF_BOOT_AUTOCONF;
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vt8500_port->clk = of_clk_get(pdev->dev.of_node, 0);
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if (vt8500_port->clk) {
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if (!IS_ERR(vt8500_port->clk)) {
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vt8500_port->uart.uartclk = clk_get_rate(vt8500_port->clk);
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} else {
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/* use the default of 24Mhz if not specified and warn */
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