common clk: fix clk_register_fixed_rate() under memory pressure

[Mark Brown]

On Mon, Apr 09, 2012 at 02:52:15PM -0700, Turquette, Mike wrote:

> Thanks for the patch Domenico.  I did a big cleanup of the
> registration code for all of the basic clock types and a fix for this
> has already been rolled in to that branch, so I won't be taking this
> patch.  I'll Cc you on the fixes when I send them to the list
> (probably tomorrow).

Would it be possible for you to keep a tree in -next?  There's been
several people sending patches like this which have been superceeded by
your work and this might help avoid such duplicated work.