[aravis] arv_camera: fix the minimum value for the ROI offsets.

[Emmanuel Pacaud <emmanuel src gnome org>]

commit 428d4001387db18dacf75f41a6539e80306665b0
Author: Tom Cobb <tom cobb diamond ac uk>
Date:   Thu Jan 6 10:01:51 2011 +0100

    arv_camera: fix the minimum value for the ROI offsets.
    
    The current code start ROI offsets from 1, but my camera (prosilica GC1020)
    starts from 0.

 src/arvcamera.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/arvcamera.c b/src/arvcamera.c
index fa1eef1..5c138fd 100644
--- a/src/arvcamera.c
+++ b/src/arvcamera.c
@@ -151,9 +151,9 @@ arv_camera_set_region (ArvCamera *camera, int x, int y, int width, int height)
 {
 	g_return_if_fail (ARV_IS_CAMERA (camera));
 
-	if (x > 0)
+	if (x >= 0)
 		arv_device_set_integer_feature_value (camera->priv->device, "OffsetX", x);
-	if (y > 0)
+	if (y >= 0)
 		arv_device_set_integer_feature_value (camera->priv->device, "OffsetY", y);
 	if (width > 0)
 		arv_device_set_integer_feature_value (camera->priv->device, "Width", width);