[PATCH] sink, source: Prevent unnecessary rate update attempts

[arun.raghavan@xxxxxxxxxxxxxxx (Arun Raghavan)]

On Thu, 2012-11-15 at 15:58 +0530, Arun Raghavan wrote:
> We don't need to try a rate update if the desired sample rate is the
> same as the one the sink or source is already using.
> ---

Pushed this.

-- Arun