In many of clk_disable() implementations, it is a no-op for a NULL
pointer input, but this is one of the exceptions.

Making it treewide consistent will allow clock consumers to call
clk_disable() without NULL pointer check.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Wan Zongshun <mcuos.com@gmail.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>