[intel] Remove useless intel_region_idle.

The idling it was trying to ensure was covered by the
intel_miptree_image_map()->intel_region_map() that immediately followed it.

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

@@ -49,23 +49,6 @@
 
 #define FILE_DEBUG_FLAG DEBUG_REGION
 
-void
-intel_region_idle(struct intel_context *intel, struct intel_region *region)
-{
-   DBG("%s\n", __FUNCTION__);
-   /* XXX: Using this function is likely bogus -- it ought to only have been
-    * used before a map, anyway, but leave this cheap implementation of it
-    * for now.
-    */
-   if (region && region->buffer) {
-      /* Mapping it for read will ensure that any acceleration to the region
-       * would have landed already.
-       */
-      dri_bo_map(region->buffer, GL_TRUE);
-      dri_bo_unmap(region->buffer);
-   }
-}
-
 /* XXX: Thread safety?
  */
 GLubyte *

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

@@ -73,9 +73,6 @@ void intel_region_release(struct intel_region **ib);
 
 void intel_recreate_static_regions(struct intel_context *intel);
 
-void intel_region_idle(struct intel_context *intel,
-		       struct intel_region *ib);
-
 /* Map/unmap regions.  This is refcounted also: 
  */
 GLubyte *intel_region_map(struct intel_context *intel,

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

@@ -457,10 +457,6 @@ intelTexImage(GLcontext * ctx,
    if (!pixels)
       return;
 
-
-   if (intelImage->mt)
-      intel_region_idle(intel, intelImage->mt->region);
-
    LOCK_HARDWARE(intel);
 
    if (intelImage->mt) {

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

@@ -64,9 +64,6 @@ intelTexSubimage(GLcontext * ctx,
    if (!pixels)
       return;
 
-   if (intelImage->mt)
-      intel_region_idle(intel, intelImage->mt->region);
-
    LOCK_HARDWARE(intel);
 
    /* Map buffer if necessary.  Need to lock to prevent other contexts