spi: atmel: remove redundant label out_free

spi: atmel: remove redundant label out_free

The error exit label out_free is no longer being used, it is redundant
and can be removed.

Cleans up warning:
drivers/spi/spi-atmel.c:1680:1: warning: label ‘out_free’ defined but not used [-Wunused-label]

Fixes: 2d9a744685bc ("spi: atmel: No need to call spi_master_put() if spi_alloc_master() failed")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Link: https://lore.kernel.org/r/20200709101203.1374117-1-colin.king@canonical.com
Signed-off-by: Mark Brown <broonie@kernel.org>