remove reference to obsolete ExtDivide

src/gallium/drivers/i965simple/brw_wm_glsl.c

@@ -124,10 +124,6 @@ static struct brw_reg get_src_reg(struct brw_wm_compile *c,
     */
    component = get_ext_swz(src->SrcRegisterExtSwz, component);
 
-   /* Can't handle this, don't know if we need to:
-    */
-   assert(src->SrcRegisterExtSwz.ExtDivide == TGSI_EXTSWIZZLE_ONE);
-       
    /* Not handling indirect lookups yet:
     */
    assert(src->SrcRegister.Indirect == 0);