mesa,st/mesa: fix WPOS adjustment

Tested-by: Marek Olšák <maraeo@gmail.com>
diff --git a/src/mesa/program/prog_statevars.h b/src/mesa/program/prog_statevars.h
index 9fe8d81..04af3f4 100644
--- a/src/mesa/program/prog_statevars.h
+++ b/src/mesa/program/prog_statevars.h
@@ -120,7 +120,7 @@
    STATE_PT_BIAS,               /**< Pixel transfer RGBA bias */
    STATE_SHADOW_AMBIENT,        /**< ARB_shadow_ambient fail value; token[2] is texture unit index */
    STATE_FB_SIZE,               /**< (width-1, height-1, 0, 0) */
-   STATE_FB_WPOS_Y_TRANSFORM,   /**< (1, 0, -1, height-1) if a FBO is bound, (-1, height-1, 1, 0) otherwise */
+   STATE_FB_WPOS_Y_TRANSFORM,   /**< (1, 0, -1, height) if a FBO is bound, (-1, height, 1, 0) otherwise */
    STATE_ROT_MATRIX_0,          /**< ATI_envmap_bumpmap, rot matrix row 0 */
    STATE_ROT_MATRIX_1,          /**< ATI_envmap_bumpmap, rot matrix row 1 */
    STATE_INTERNAL_DRIVER	/* first available state index for drivers (must be last) */