sh: fix a kfree address in clkdev code

kfree() in clkdev_drop() function should actually be called with an address of
a struct clk_lookup_alloc object, and not struct clk_lookup, as presently done.
This just happens to work, because "struct clk_lookup cl" is the first
member in struct clk_lookup_alloc.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/kernel/clkdev.c

@@ -161,9 +161,11 @@ EXPORT_SYMBOL(clk_add_alias);
  */
 void clkdev_drop(struct clk_lookup *cl)
 {
+	struct clk_lookup_alloc *cla = container_of(cl, struct clk_lookup_alloc, cl);
+
 	mutex_lock(&clocks_mutex);
 	list_del(&cl->node);
 	mutex_unlock(&clocks_mutex);
-	kfree(cl);
+	kfree(cla);
 }
 EXPORT_SYMBOL(clkdev_drop);