nfsd: use hash table from cache detail in nfsd export seq ops

Hard-code is redundant and will prevent from making caches per net ns.
Signed-off-by: NStanislav Kinsbursky <skinsbursky@parallels.com>
Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>

fs/nfsd/export.c

@@ -1035,6 +1035,7 @@ static void *e_start(struct seq_file *m, loff_t *pos)
 	unsigned hash, export;
 	struct cache_head *ch;
 	struct cache_detail *cd = m->private;
+	struct cache_head **export_table = cd->hash_table;
 
 	read_lock(&cd->hash_lock);
 	if (!n--)
@@ -1061,6 +1062,8 @@ static void *e_next(struct seq_file *m, void *p, loff_t *pos)
 {
 	struct cache_head *ch = p;
 	int hash = (*pos >> 32);
+	struct cache_detail *cd = m->private;
+	struct cache_head **export_table = cd->hash_table;
 
 	if (p == SEQ_START_TOKEN)
 		hash = 0;