st/nine: Upload managed textures only at draw using them

When a draw call is emited, textures in the
device->update_textures list are uploaded.

This patch removes textures from the list if they
are not bound anymore.

Signed-off-by: Axel Davy <davyaxel0@gmail.com>

src/gallium/state_trackers/nine/basetexture9.h

@@ -144,8 +144,11 @@ NineBindTextureToDevice( struct NineDevice9 *device,
 
         tex->bind_count++;
     }
-    if (old)
+    if (old) {
         old->bind_count--;
+        if (!old->bind_count)
+            list_delinit(&old->list);
+    }
 
     nine_bind(slot, tex);
 }