st/xorg: Fix two leeks

We where leaking both surfaces in the composit code
	and textures from pixmaps.

src/gallium/state_trackers/xorg/xorg_composite.c

@@ -359,6 +359,9 @@ bind_framebuffer_state(struct exa_context *exa, struct exa_pixmap_priv *pDst)
    state.zsbuf = 0;
 
    cso_set_framebuffer(exa->cso, &state);
+
+   /* we do fire and forget for the framebuffer, this is the forget part */
+   pipe_surface_reference(&surface, NULL);
 }
 
 enum AxisOrientation {

src/gallium/state_trackers/xorg/xorg_exa.c

@@ -671,6 +671,8 @@ ExaModifyPixmapHeader(PixmapPtr pPixmap, int width, int height,
 #endif
 
 	pipe_texture_reference(&priv->tex, texture);
+	/* the texture we create has one reference */
+	pipe_texture_reference(&texture, NULL);
     }
 
     return TRUE;