PM: clk: make pm_clk_add_notifier() take a const pointer

The driver core wants to work with const struct bus_type, so there's no
reason that pm_clk_add_notifier() should not also do the same thing,
considering that it just passes the pointer off to the driver core which
is expecting a const *.

Cc: Rafael J. Wysocki <rafael@kernel.org>
Link: https://lore.kernel.org/r/2023121922-triumph-exploit-f545@gregkh
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: gregkh

drivers/base/power/clock_ops.c

@@ -793,7 +793,7 @@ static int pm_clk_notify(struct notifier_block *nb,
  * the remaining members of @clknb should be populated prior to calling this
  * routine.
  */
-void pm_clk_add_notifier(struct bus_type *bus,
+void pm_clk_add_notifier(const struct bus_type *bus,
 				 struct pm_clk_notifier_block *clknb)
 {
 	if (!bus || !clknb)

include/linux/pm_clock.h

@@ -91,10 +91,10 @@ static inline int devm_pm_clk_create(struct device *dev)
 #endif
 
 #ifdef CONFIG_HAVE_CLK
-extern void pm_clk_add_notifier(struct bus_type *bus,
+extern void pm_clk_add_notifier(const struct bus_type *bus,
 					struct pm_clk_notifier_block *clknb);
 #else
-static inline void pm_clk_add_notifier(struct bus_type *bus,
+static inline void pm_clk_add_notifier(const struct bus_type *bus,
 					struct pm_clk_notifier_block *clknb)
 {
 }