lib: fix for dynamically grown hashes

Fixes commit 97c84db00c (hash: dynamically grow hash table). The
no_expand field it's not initialized and could make the hashes to
never grow the table index.

Signed-off-by: Jorge Boncompte [DTI2] <jorge@dti2.net>
Acked-by: Feng Lu <lu.feng@6wind.com>
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
diff --git a/lib/hash.c b/lib/hash.c
index 987012a..56e41fa 100644
--- a/lib/hash.c
+++ b/lib/hash.c
@@ -36,6 +36,7 @@
   hash->index = XCALLOC (MTYPE_HASH_INDEX,
 			 sizeof (struct hash_backet *) * size);
   hash->size = size;
+  hash->no_expand = 0;
   hash->hash_key = hash_key;
   hash->hash_cmp = hash_cmp;
   hash->count = 0;