reset: sti: add a missing blank line after declaration

This just fixes a checkpatch warning, no functional change.
Signed-off-by: NPhilipp Zabel <p.zabel@pengutronix.de>
Acked-by: NMaxime Coquelin <maxime.coquelin@st.com>

drivers/reset/sti/reset-syscfg.c

@@ -103,7 +103,9 @@ static int syscfg_reset_deassert(struct reset_controller_dev *rcdev,
 static int syscfg_reset_dev(struct reset_controller_dev *rcdev,
 			    unsigned long idx)
 {
-	int err = syscfg_reset_assert(rcdev, idx);
+	int err;
+
+	err = syscfg_reset_assert(rcdev, idx);
 	if (err)
 		return err;