staging: wilc1000: wilc_deinit(): fixes inconsistent returns

This patch fixes the warning reported by smatch.
 - wilc_deinit() warn: inconsistent returns 'sem:&hif_drv->sem_cfg_values'

This semaphore protect a cfg_values variable but cfg_values variables was not
used here. So, just remove this line.

Signed-off-by: Leo Kim <leo.kim@atmel.com>
Signed-off-by: Glen Lee <glen.lee@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>