V4L/DVB (5900): usbvision: fix bugs [sg]_register functions

s_register was assigning the return code to (unsigned)reg->val, rather than
errCode, which it what it would return.  Except reg->val can't be < 0, so it
would never actually return an error.

g_register never actually put the value it read into reg->val.
Signed-off-by: Trent Piepho <xyzzy@speakeasy.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/video/usbvision/usbvision-video.c

@@ -517,6 +517,7 @@ static int vidioc_g_register (struct file *file, void *priv,
 		    __FUNCTION__, errCode);
 		return errCode;
 	}
+	reg->val = errCode;
 	return 0;
 }
 
@@ -531,8 +532,8 @@ static int vidioc_s_register (struct file *file, void *priv,
 	if (!v4l2_chip_match_host(reg->match_type, reg->match_chip))
 		return -EINVAL;
 	/* NT100x has a 8-bit register space */
-	reg->val = (u8)usbvision_write_reg(usbvision, reg->reg&0xff, reg->val);
-	if (reg->val < 0) {
+	errCode = usbvision_write_reg(usbvision, reg->reg&0xff, reg->val);
+	if (errCode < 0) {
 		err("%s: VIDIOC_DBG_S_REGISTER failed: error %d",
 		    __FUNCTION__, errCode);
 		return errCode;