Add a check which compares the passed in size of the DDX driver private DRI

structure to the 3D drivers view of it, and abort if they don't match.

This traps the case with the drmAddress removal in the DDX driver.

src/mesa/drivers/dri/i915/intel_screen.c

@@ -79,6 +79,10 @@ static GLboolean intelInitDriver(__DRIscreenPrivate *sPriv)
      (PFNGLXSCRENABLEEXTENSIONPROC) (*dri_interface->getProcAddress("glxEnableExtension"));
    void * const psc = sPriv->psc->screenConfigs;
 
+   if (sPriv->devPrivSize != sizeof(I830DRIRec)) {
+      fprintf(stderr,"\nERROR!  sizeof(I830DRIRec) does not match passed size from 2D driver\n");
+      return GL_FALSE;
+   }
 
    /* Allocate the private area */
    intelScreen = (intelScreenPrivate *)CALLOC(sizeof(intelScreenPrivate));