spi: atmel: Put allocated master before return

The allocated master is not released. Goto error handling label rather
than directly return.

Fixes: 5e9af37e

 ("spi: atmel: introduce probe deferring")
Signed-off-by: Pan Bian <bianpan2016@163.com>
Fixes: 5e9af37e

 ("spi: atmel: introduce probe deferring")
Reviewed-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Link: https://lore.kernel.org/r/20210120050025.25426-1-bianpan2016@163.com


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