[PATCH] spi: sirf: replace BUG condition by error code for unsupported transfer

[Mark Brown]

On Mon, Apr 27, 2015 at 09:22:28AM +0000, Barry Song wrote:
> From: Qipan Li <Qipan.Li at csr.com>
> 
> return error for unsupported bits-per-word format, BUG() is not right
> for this scenerios as we are not an ASSERT but an error handler.

Applied, thanks.
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