ARM: DaVinci: Deletion of an unnecessary check before the function call "__clk_disable"

[SF Markus Elfring]

> The __clk_disable() function tests whether its argument is NULL and then
> returns immediately. Thus the test around the call is not needed.

I was a bit too quick to send you this notification. I stumbled once more
on the detail that my source code analysis approach is incomplete for
static functions so far.

https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/tree/arch/arm/mach-davinci/clock.c?id=a7ca2bcf2d2ef15c343a12f2a4c2e06380a0f495#n47
https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/tree/drivers/clk/clk.c?id=4dc7ed32f398fa76b9e1d243a852420b1dad0150#n846

I would like to apologise for confusion I introduced here.

Regards,
Markus