spi: atmel: No need to call spi_master_put() if spi_alloc_master() failed

There is no need to call spi_master_put() if spi_alloc_master()
failed, it should return -ENOMEM directly.

Signed-off-by: Peng Fan <fanpeng@loongson.cn>
Link: https://lore.kernel.org/r/1594111842-9468-1-git-send-email-fanpeng@loongson.cn


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