[core] removed unused compare function, removed annoying warning;

lib/sxmplv2.c

@@ -445,11 +445,6 @@ sxlink_t *__link_minimal_alloc(struct in_addr *addr)
   return NULL;
 }
 
-static long __cmp_u64(const void *a, const void *b)
-{
-  return *(uint64_t *)a - *(uint64_t *)b;
-}
-
 static int __link_second_alloc(sxlink_t *co)
 {
   usrtc_node_init(&co->csnode, co);
@@ -695,7 +690,7 @@ static void *__sxmpl_thread(void *b)
   struct timespec wtick;
   int dispatch = 0, e;
   size_t rd, wr;
-  ulong_t mid;
+  ulong_t mid = 0;
 #ifdef _PERFPROFILE
   struct timeval beg, end;
 #endif