drm/exynos: fimc: signedness bug in fimc_setup_clocks()

"id" needs to be signed for the error handling to work.

Fixes: 7a2d5c7 ("drm/exynos: fimc: Convert driver to IPP v2 core API")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

drivers/gpu/drm/exynos/exynos_drm_fimc.c

@@ -1200,7 +1200,7 @@ static int fimc_setup_clocks(struct fimc_context *ctx)
 
 int exynos_drm_check_fimc_device(struct device *dev)
 {
-	unsigned int id = of_alias_get_id(dev->of_node, "fimc");
+	int id = of_alias_get_id(dev->of_node, "fimc");
 
 	if (id >= 0 && (BIT(id) & fimc_mask))
 		return 0;