i965: Remove the now unused intel_renderbuffer::draw_offset field.

The previous commit removed the last use of this field.

Reviewed-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>

src/mesa/drivers/dri/intel/intel_fbo.c

@@ -606,7 +606,6 @@ intel_renderbuffer_set_draw_offset(struct intel_renderbuffer *irb,
 				  zoffset,
 				  &dst_x, &dst_y);
 
-   irb->draw_offset = (dst_y * mt->region->pitch + dst_x) * mt->cpp;
    irb->draw_x = dst_x;
    irb->draw_y = dst_y;
 }

src/mesa/drivers/dri/intel/intel_fbo.h

@@ -58,7 +58,6 @@ struct intel_renderbuffer
 
    /** \} */
 
-   GLuint draw_offset; /**< Offset of drawing address within the region */
    GLuint draw_x, draw_y; /**< Offset of drawing within the region */
 };