[PATCH] octstr.c, octrst_imm, one more check

I've struggled over some condition making octstr_imm stumble, 
this check keeps it from segfaulting.

sincerely, 
Wilfried Goesgens



gwlib/octstr.c        2005-04-13 18:13:38.000000000 +0200
+++ octstr.c    2005-04-13 18:49:03.000000000 +0200
@@ -285,7 +285,7 @@ Octstr *octstr_imm(const char *cstr)
     mutex_lock(&immutables_mutex);
     i = index;
     for (; ; ) {
-       if (immutables[i] == NULL || immutables[i]->data == data)
+       if (immutables == NULL || immutables[i] == NULL || immutables[i]->data == data)
             break;
         i = (i + 1) % MAX_IMMUTABLES;
         if (i == index)