pos--; 
static void *nommu_vma_list_start(struct seq_file *m, loff_t *_pos){	struct rb_node *_rb;	loff_t pos = *_pos;	void *next = NULL;	down_read(&nommu_vma_sem);	for (_rb = rb_first(&nommu_vma_tree); _rb; _rb = rb_next(_rb)) {		if (pos == 0) {			next = _rb;			break;		}	}	return next;}
4520	/local/tlutelli/issta_data/temp/c/2005_temp/2005/4520/b65574fec5db1211bce7fc8bec7a2b32486e0670/nommu.c/buggy/fs/proc/nommu.c