staging: wilc1000: rename variable s32Error

This patch renames variable s32Error to result
to avoid CamelCase naming convention.
Signed-off-by: NLeo Kim <leo.kim@atmel.com>
Signed-off-by: NTony Cho <tony.cho@atmel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>