spi: More sanity checks for transfers
authorMark Brown <broonie@linaro.org>
Wed, 10 Jul 2013 14:05:40 +0000 (15:05 +0100)
committerMark Brown <broonie@linaro.org>
Mon, 15 Jul 2013 10:34:51 +0000 (11:34 +0100)
Check that transfers are non-empty and that there is a completion for
them.

Signed-off-by: Mark Brown <broonie@linaro.org>

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