Resolves: #472999

Summary: vlv: memory leak
Description: if the addresses of the passed key and the returned key don't
match, the space for the returned key is allocated in libdb.  Thus, we have to
release the returned key.

ldap/servers/slapd/back-ldbm/vlv.c

@@ -990,6 +990,10 @@ vlv_build_candidate_list_byvalue( struct vlvIndex* p, DBC *dbc, PRUint32 length,
         }
         LDAPDebug( LDAP_DEBUG_TRACE, "<= vlv_build_candidate_list_byvalue: Not Found. Index=%lu\n",si,0,0);
     }
+    if (key.data != typedown_value[0]->bv_val) { /* in case new key is set 
+                                                  in dbc->c_get(DB_SET_RANGE) */
+        slapi_ch_free(&(key.data));
+    }
     ber_bvecfree((struct berval**)typedown_value);
     return si;
 }