r600g: make a local copy of viewport state

src/gallium/drivers/r600/r600_blit.c

@@ -50,7 +50,7 @@ static void r600_blitter_save_states(struct pipe_context *ctx)
 	util_blitter_save_vertex_elements(rctx->blitter,
 					rctx->vertex_elements);
 	util_blitter_save_viewport(rctx->blitter,
-					rctx->viewport);
+					&rctx->viewport);
 }
 
 void r600_clear(struct pipe_context *ctx, unsigned buffers,

src/gallium/drivers/r600/r600_context.h

@@ -76,7 +76,7 @@ struct r600_context {
 	struct pipe_stencil_ref		stencil_ref;
 	struct pipe_framebuffer_state	fb_state;
 	struct radeon_draw		*draw;
-	struct pipe_viewport_state *viewport;
+	struct pipe_viewport_state	viewport;
 };
 
 void r600_draw_arrays(struct pipe_context *ctx, unsigned mode,

src/gallium/drivers/r600/r600_state.c

@@ -309,7 +309,7 @@ static void r600_set_viewport_state(struct pipe_context *ctx,
 		return;
 	}
 	radeon_draw_set_new(rctx->draw, rstate);
-	rctx->viewport = state;
+	rctx->viewport = *state;
 }
 
 static void r600_set_vertex_buffers(struct pipe_context *ctx,