misc: mic: vop: vop_main: Remove set but unused variable 'ret'

Hasn't been checked since its conception 2 years ago.

Squashes W=1 warning:

 drivers/misc/mic/vop/vop_main.c: In function ‘_vop_scan_devices’:
 drivers/misc/mic/vop/vop_main.c:617:6: warning: variable ‘ret’ set but not used [-Wunused-but-set-variable]
 617 | int ret;
 | ^~~

Cc: Sudeep Dutt <sudeep.dutt@intel.com>
Cc: Ashutosh Dixit <ashutosh.dixit@intel.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20200626130525.389469-8-lee.jones@linaro.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/misc/mic/vop/vop_main.c

@@ -614,7 +614,6 @@ static void _vop_scan_devices(void __iomem *dp, struct vop_device *vpdev,
 	struct mic_device_desc __iomem *d;
 	struct mic_device_ctrl __iomem *dc;
 	struct device *dev;
-	int ret;
 
 	for (i = sizeof(struct mic_bootparam);
 			i < MIC_DP_SIZE; i += _vop_total_desc_size(d)) {
@@ -644,7 +643,7 @@ static void _vop_scan_devices(void __iomem *dp, struct vop_device *vpdev,
 					 &dc->config_change);
 			put_device(dev);
 			_vop_handle_config_change(d, i, vpdev);
-			ret = _vop_remove_device(d, i, vpdev);
+			_vop_remove_device(d, i, vpdev);
 			if (remove) {
 				iowrite8(0, &dc->config_change);
 				iowrite8(0, &dc->guest_ack);