drm/imx: imx-tve: Remove unused variable

'ret' is never used in tve_enable/tve_disable(), so just
remove it.
Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1483544696-32707-1-git-send-email-fabio.estevam@nxp.com

drivers/gpu/drm/imx/imx-tve.c

@@ -150,12 +150,10 @@ __releases(&tve->lock)
 
 static void tve_enable(struct imx_tve *tve)
 {
-	int ret;
-
 	if (!tve->enabled) {
 		tve->enabled = true;
 		clk_prepare_enable(tve->clk);
-		ret = regmap_update_bits(tve->regmap, TVE_COM_CONF_REG,
+		regmap_update_bits(tve->regmap, TVE_COM_CONF_REG,
 				   TVE_EN, TVE_EN);
 	}
 
@@ -174,12 +172,9 @@ static void tve_enable(struct imx_tve *tve)
 
 static void tve_disable(struct imx_tve *tve)
 {
-	int ret;
-
 	if (tve->enabled) {
 		tve->enabled = false;
-		ret = regmap_update_bits(tve->regmap, TVE_COM_CONF_REG,
-					 TVE_EN, 0);
+		regmap_update_bits(tve->regmap, TVE_COM_CONF_REG, TVE_EN, 0);
 		clk_disable_unprepare(tve->clk);
 	}
 }