avr32: clean up memory allocation in at32_add_device_mci
This patch will check if the kzalloc for the MCI DMA struct actually returns a valid address, and also clean up properly if it fails or the function fails at a later stage. This also silences a compiler warning about using the slave variable uninitialized. Signed-off-by: NHans-Christian Egtvedt <hans-christian.egtvedt@atmel.com> Signed-off-by: NHaavard Skinnemoen <haavard.skinnemoen@atmel.com>
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