spi: atmel: Fix incorrect error path

'irq' was not released when clk_prepare_enable failed.
Fix it.

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
1 file changed