clk: kendryte: no need to check argument of free()

free() checks if its argument is NULL. No need to check it twice.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Sean Anderson <seanga2@gmail.com>

drivers/clk/kendryte/clk.c

@@ -471,8 +471,7 @@ cleanup_gate:
 cleanup_div:
 	free(div);
 cleanup_mux:
-	if (mux)
-		free(mux);
+	free(mux);
 	return comp;
 }