clk: ccf: mux: fix typo

Close the opening bracket.

Signed-off-by: Dario Binacchi <dariobin@libero.it>
diff --git a/drivers/clk/clk-mux.c b/drivers/clk/clk-mux.c
index 69f1e9c..978f3a8 100644
--- a/drivers/clk/clk-mux.c
+++ b/drivers/clk/clk-mux.c
@@ -191,7 +191,7 @@
 	 * Read the current mux setup - so we assign correct parent.
 	 *
 	 * Changing parent would require changing internals of udevice struct
-	 * for the corresponding clock (to do that define .set_parent() method.
+	 * for the corresponding clock (to do that define .set_parent() method).
 	 */
 	ret = clk_register(clk, UBOOT_DM_CLK_CCF_MUX, name,
 			   parent_names[clk_mux_get_parent(clk)]);