Fix two new-in-9.0 bugs in hstore.

There was an incorrect Assert in hstoreValidOldFormat(), which would cause
immediate core dumps when attempting to work with pre-9.0 hstore data,
but of course only in an assert-enabled build.

Also, ghstore_decompress() incorrectly applied DatumGetHStoreP() to a datum
that wasn't actually an hstore, but rather a ghstore (ie, a gist signature
bitstring).  That used to be harmless, but could now result in misbehavior
if the hstore format conversion code happened to trigger.  In reality,
since ghstore is not marked toastable (and doesn't need to be), this
function is useless anyway; we can lobotomize it down to returning the
passed-in pointer.

Both bugs found by Andrew Gierth, though this isn't exactly his proposed
patch.

contrib/hstore/hstore_compat.c

 /*
- * $PostgreSQL: pgsql/contrib/hstore/hstore_compat.c,v 1.2 2010/02/26 02:00:32 momjian Exp $
+ * $PostgreSQL: pgsql/contrib/hstore/hstore_compat.c,v 1.3 2010/09/16 02:54:01 tgl Exp $
  *
  * Notes on old/new hstore format disambiguation.
  *
@@ -180,7 +180,8 @@ hstoreValidOldFormat(HStore *hs)
 	if (hs->size_ & HS_FLAG_NEWVERSION)
 		return 0;
 
-	Assert(sizeof(HOldEntry) == sizeof(HEntry));
+	/* New format uses an HEntry for key and another for value */
+	Assert(sizeof(HOldEntry) == (2 * sizeof(HEntry)));
 
 	if (count == 0)
 		return 2;

contrib/hstore/hstore_gist.c

 /*
- * $PostgreSQL: pgsql/contrib/hstore/hstore_gist.c,v 1.12 2010/02/26 02:00:32 momjian Exp $
+ * $PostgreSQL: pgsql/contrib/hstore/hstore_gist.c,v 1.13 2010/09/16 02:54:01 tgl Exp $
  */
 #include "postgres.h"
 
@@ -168,28 +168,14 @@ ghstore_compress(PG_FUNCTION_ARGS)
 	PG_RETURN_POINTER(retval);
 }
 
+/*
+ * Since type ghstore isn't toastable (and doesn't need to be),
+ * this function can be a no-op.
+ */
 Datum
 ghstore_decompress(PG_FUNCTION_ARGS)
 {
-	GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
-	GISTENTRY  *retval;
-	HStore	   *key;
-
-	key = DatumGetHStoreP(entry->key);
-
-	if (key != (HStore *) DatumGetPointer(entry->key))
-	{
-		/* need to pass back the decompressed item */
-		retval = palloc(sizeof(GISTENTRY));
-		gistentryinit(*retval, PointerGetDatum(key),
-					  entry->rel, entry->page, entry->offset, entry->leafkey);
-		PG_RETURN_POINTER(retval);
-	}
-	else
-	{
-		/* we can return the entry as-is */
-		PG_RETURN_POINTER(entry);
-	}
+	PG_RETURN_POINTER(PG_GETARG_POINTER(0));
 }
 
 Datum