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 <[e-mail]>
Cc: Ashutosh Dixit <[e-mail]>
Cc: Christian Borntraeger <[e-mail]>
Acked-by: Arnd Bergmann <[e-mail]>
Signed-off-by: Lee Jones <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/misc/mic/vop/vop_main.c

···
 	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)) {
···
 					 &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);