if (i >= 1<<tn->bits) trie_bug("tnode_get_child"); 
BUG_ON(i >= 1 << tn->bits); 
static inline struct node *tnode_get_child(struct tnode *tn, int i){        if (i >= 1<<tn->bits)                trie_bug("tnode_get_child");        return tn->child[i];}
4520	/local/tlutelli/issta_data/temp/c/2005_temp/2005/4520/91b9a277fc4d207249e459a455abf804ebb5499d/fib_trie.c/buggy/net/ipv4/fib_trie.c