drm/exynos: simplify the return value handling in exynos_dp_get_modes()

Just use 0 and 1 directly, instead of the confusing local variable
that's always set to 0.

Cc: Inki Dae <inki.dae@samsung.com>
Cc: Seung-Woo Kim <sw0312.kim@samsung.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/64cc680f14d961cedb726a6fd5c6dfd53ca9bb85.1709913674.git.jani.nikula@intel.comSigned-off-by: Jani Nikula <jani.nikula@intel.com>

drivers/gpu/drm/exynos/exynos_dp.c

@@ -74,16 +74,15 @@ static int exynos_dp_get_modes(struct analogix_dp_plat_data *plat_data,
 {
 	struct exynos_dp_device *dp = to_dp(plat_data);
 	struct drm_display_mode *mode;
-	int num_modes = 0;
 
 	if (dp->plat_data.panel)
-		return num_modes;
+		return 0;
 
 	mode = drm_mode_create(connector->dev);
 	if (!mode) {
 		DRM_DEV_ERROR(dp->dev,
 			      "failed to create a new display mode.\n");
-		return num_modes;
+		return 0;
 	}
 
 	drm_display_mode_from_videomode(&dp->vm, mode);
@@ -94,7 +93,7 @@ static int exynos_dp_get_modes(struct analogix_dp_plat_data *plat_data,
 	drm_mode_set_name(mode);
 	drm_mode_probed_add(connector, mode);
 
-	return num_modes + 1;
+	return 1;
 }
 
 static int exynos_dp_bridge_attach(struct analogix_dp_plat_data *plat_data,