Fixed a missing field.

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/branches/stable_2.4.x@4955 35acf78f-673a-0410-8e92-d51de3d6d3f4

os/kernel/src/chregistry.c

@@ -90,11 +90,7 @@ ROMCONST chdebug_t ch_debug = {
 #else
   (uint8_t)0,
 #endif
-#if CH_TIME_QUANTUM > 0
-  (uint8_t)_offsetof(Thread, p_preempt),
-#else
-  (uint8_t)0,
-#endif
+  (uint8_t)0, /* Not used in 2.4.x.*/
 #if CH_DBG_THREADS_PROFILING
   (uint8_t)_offsetof(Thread, p_time)
 #else