iommu/mediatek: Fix forever loop in error handling

There is a typo so this loop does i++ where i-- was intended.  It will
result in looping until the kernel crashes.

Fixes: 2659392 ("iommu/mediatek: Add error path for loop of mm_dts_parse")
Signed-off-by: Dan Carpenter <error27@gmail.com>
Reviewed-by: Yong Wu <yong.wu@mediatek.com>
Link: https://lore.kernel.org/r/Y5C3mTam2nkbaz6o@kili
Signed-off-by: Joerg Roedel <jroedel@suse.de>

Author: error27

drivers/iommu/mtk_iommu.c

@@ -1159,8 +1159,7 @@ static int mtk_iommu_mm_dts_parse(struct device *dev, struct component_match **m
 	return 0;
 
 err_larbdev_put:
-	/* id may be not linear mapping, loop whole the array */
-	for (i = MTK_LARB_NR_MAX - 1; i >= 0; i++) {
+	for (i = MTK_LARB_NR_MAX - 1; i >= 0; i--) {
 		if (!data->larb_imu[i].dev)
 			continue;
 		put_device(data->larb_imu[i].dev);