clk: fix comment of devm_clk_hw_register()

Unlike devm_clk_register(), devm_clk_hw_register() returns integer.
So, the statement "Clocks returned from this function ..." sounds
odd.  Adjust the comment for this new API.
Signed-off-by: NMasahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: NStephen Boyd <sboyd@codeaurora.org>

drivers/clk/clk.c

@@ -2719,7 +2719,7 @@ EXPORT_SYMBOL_GPL(devm_clk_register);
  * @dev: device that is registering this clock
  * @hw: link to hardware-specific clock data
  *
- * Managed clk_hw_register(). Clocks returned from this function are
+ * Managed clk_hw_register(). Clocks registered by this function are
  * automatically clk_hw_unregister()ed on driver detach. See clk_hw_register()
  * for more information.
  */