st/xorg: drop set but unsused variables dxo, dyo

Commit a9f8baf00b removed the first and only use of the variables
but forgot to remove them.

Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
Reviewed-by: Brian Paul <brianp@vmware.com>

src/gallium/state_trackers/xorg/xorg_xv.c

@@ -490,7 +490,6 @@ display_video(ScrnInfoPtr pScrn, struct xorg_xv_port_priv *pPriv, int id,
    modesettingPtr ms = modesettingPTR(pScrn);
    BoxPtr pbox;
    int nbox;
-   int dxo, dyo;
    Bool hdtv;
    int x, y, w, h;
    struct exa_pixmap_priv *dst;
@@ -518,9 +517,6 @@ display_video(ScrnInfoPtr pScrn, struct xorg_xv_port_priv *pPriv, int id,
                     -pPixmap->screen_y);
 #endif
 
-   dxo = dstRegion->extents.x1;
-   dyo = dstRegion->extents.y1;
-
    pbox = REGION_RECTS(dstRegion);
    nbox = REGION_NUM_RECTS(dstRegion);