Fixes:

arch/arm/boards/crystalfontz-cfa10036/cfa10036.c: In function 'cfa10036_devices_init':
arch/arm/boards/crystalfontz-cfa10036/cfa10036.c:119:9: warning: unused variable 'ret' [-Wunused-variable]
arch/arm/boards/chumby_falconwing/falconwing.c: In function 'falconwing_devices_init':
arch/arm/boards/chumby_falconwing/falconwing.c:287:9: warning: unused variable 'rc' [-Wunused-variable]
arch/arm/boards/imx233-olinuxino/imx23-olinuxino.c: In function 'imx23_olinuxino_devices_init':
arch/arm/boards/imx233-olinuxino/imx23-olinuxino.c:118:9: warning: unused variable 'rc' [-Wunused-variable]

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>