intel: Return false like other blit failure paths if out of aperture.

The primary consumer of this (miptree relayout) already has this code
for handling failure, and the other paths want to know if failure
actually occurs and do something appropriate, which may not include
memcpy.

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

@@ -121,22 +121,8 @@ intelEmitCopyBlit(struct intel_context *intel,
 
    intel_prepare_render(intel);
 
-   if (pass >= 2) {
-      drm_intel_gem_bo_map_gtt(dst_buffer);
-      drm_intel_gem_bo_map_gtt(src_buffer);
-      _mesa_copy_rect((GLubyte *)dst_buffer->virtual + dst_offset,
-		      cpp,
-		      dst_pitch,
-		      dst_x, dst_y,
-		      w, h,
-		      (GLubyte *)src_buffer->virtual + src_offset,
-		      src_pitch,
-		      src_x, src_y);
-      drm_intel_gem_bo_unmap_gtt(src_buffer);
-      drm_intel_gem_bo_unmap_gtt(dst_buffer);
-
-      return GL_TRUE;
-   }
+   if (pass >= 2)
+      return GL_FALSE;
 
    intel_batchbuffer_require_space(intel->batch, 8 * 4);
    DBG("%s src:buf(%p)/%d+%d %d,%d dst:buf(%p)/%d+%d %d,%d sz:%dx%d\n",