clk: clk_round_rate() should return 0, not negative numbers, upon error

[Paul Walmsley]

On 11/25/2013 04:01 PM, Russell King - ARM Linux wrote:
> On Mon, Nov 25, 2013 at 03:55:33PM -0800, Paul Walmsley wrote:
>> Update the documentation for clk_round_rate() to state that it should
>> return 0 rather than a negative error code when it encounters an
>> error.  This describes how the common clock framework currently works;
>> howeever, some clock code does not yet align to this.
>>
>> This change is to prepare for returning unsigned values from
>> clk_round_rate().
> You really ought to document why this is being changed here, to help
> sell the change to parties who are not aware of the background.
> Otherwise, it just looks like a gratuitous API change.

Will do and resend.

- Paul