i2c: s3c2410: fix IRQ check

Iff platform_get_irq() returns 0, the driver's probe() method will return 0
early (as if the method's call was successful).  Let's consider IRQ0 valid
for simplicity -- devm_request_irq() can always override that decision...

Fixes: e0d1ec97 ("i2c-s3c2410: Change IRQ to be plain integer.")
Signed-off-by: NSergey Shtylyov <s.shtylyov@omp.ru>
Reviewed-by: NKrzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Signed-off-by: NWolfram Sang <wsa@kernel.org>

drivers/i2c/busses/i2c-s3c2410.c

@@ -1137,7 +1137,7 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
 	 */
 	if (!(i2c->quirks & QUIRK_POLL)) {
 		i2c->irq = ret = platform_get_irq(pdev, 0);
-		if (ret <= 0) {
+		if (ret < 0) {
 			dev_err(&pdev->dev, "cannot find IRQ\n");
 			clk_unprepare(i2c->clk);
 			return ret;