media: stk1160: fix number of buffers in case not all buffers are created

In case we fail to allocate a transfer_buffer then we
break the buffers creation loop and update the number of
buffers to the number of successfully allocated which should
be 'i' and not 'i - 1' nor 'i + 1'
Signed-off-by: Dafna Hirschfeld <dafna.hirschfeld@collabora.com>
Reviewed-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/media/usb/stk1160/stk1160-video.c

@@ -511,15 +511,15 @@ int stk1160_alloc_isoc(struct stk1160 *dev)
 	usb_free_urb(dev->isoc_ctl.urb[i]);
 	dev->isoc_ctl.urb[i] = NULL;
 
-	stk1160_warn("%d urbs allocated. Trying to continue...\n", i - 1);
+	stk1160_warn("%d urbs allocated. Trying to continue...\n", i);
 
-	dev->isoc_ctl.num_bufs = i - 1;
+	dev->isoc_ctl.num_bufs = i;
 
 	return 0;
 
 free_i_bufs:
 	/* Save the allocated buffers so far, so we can properly free them */
-	dev->isoc_ctl.num_bufs = i+1;
+	dev->isoc_ctl.num_bufs = i;
 	stk1160_free_isoc(dev);
 	return -ENOMEM;
 }