i2c: loongson: fix irq not freed when remove module

LoongArch inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I7362E

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The interrupt resource of i2c_loongson module is not free normally when
rmmod. We should free the interrupt resource in loongson_i2c_remove.
Signed-off-by: NHongchen Zhang <zhanghongchen@loongson.cn>
Change-Id: I329560ece8890f5d462b898a814bdcecd5951b6b

drivers/i2c/busses/i2c-loongson.c

@@ -508,6 +508,7 @@ static int loongson_i2c_remove(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, NULL);
 	i2c_del_adapter(&dev->adapter);
+	free_irq(dev->irq, dev);
 	iounmap(dev->base);
 	kfree(dev);
 	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);