[U-Boot] serial: bcm283x_mu: make pending values more explicit

[Tom Rini]

On Wed, Apr 13, 2016 at 10:29:52PM -0600, Stephen Warren wrote:

> dm_serial_ops.pending should return the number of characters, not just a
> valid C Boolean integer value. The existing code does already does this,
> but only as an accident since BCM283X_MU_LSR_RX_READY happens to be
> BIT(0). Enhance the code to be more explicit about the values it returns.
> 
> Suggested-by: Simon Glass <sjg at chromium.org>
> Signed-off-by: Stephen Warren <swarren at wwwdotorg.org>

Applied to u-boot/master, thanks!

-- 
Tom
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