RLOC was updated before clearing child info (ARMmbed#1547)

based on old RLOC. Fix first clears the child info based
on old RLOC before updating RLOC.

source/6LoWPAN/Thread/thread_router_bootstrap.c

@@ -1011,10 +1011,19 @@ static void thread_bootstrap_client_router_id_cb(int8_t interface_id, int8_t sta
         parent_router_id = cur->thread_info->thread_endnode_parent->router_id;
     }
 
+    tr_info("Thread Short address changed old: %x new: %x", cur->thread_info->routerShortAddress, router_rloc);
+    /*the default routerShortAddress if nothing is requested is 0xfffe so eliminate this case
+        Also make sure that the child info (from previous partition if any)
+        is cleared if the router address requested is not what is got from leader */
+    if ( cur->thread_info->routerShortAddress != router_rloc) {
+        thread_router_bootstrap_child_information_clear(cur);
+    }
+    // Release network data from old address
+    cur->thread_info->localServerDataBase.release_old_address = true;
+
     //ADD New ML16
     // This should be used thread_bootstrap_update_ml16_address(cur, router_rloc);
     thread_clean_old_16_bit_address_based_addresses(cur);
-
     mac_helper_mac16_address_set(cur, router_rloc);
     cur->thread_info->routerShortAddress = router_rloc;
     memcpy(ml16, cur->thread_info->threadPrivatePrefixInfo.ulaPrefix, 8);
@@ -1028,16 +1037,6 @@ static void thread_bootstrap_client_router_id_cb(int8_t interface_id, int8_t sta
         return;
     }
 
-    tr_info("Thread Short address changed old: %x new: %x", cur->thread_info->routerShortAddress, router_rloc);
-    /*the default routerShortAddress if nothing is requested is 0xfffe so eliminate this case
-        Also make sure that the child info (from previous partition if any)
-        is cleared if the router address requested is not what is got from leader */
-    if (cur->thread_info->routerShortAddress != router_rloc) {
-        thread_router_bootstrap_child_information_clear(cur);
-    }
-    // Release network data from old address
-    cur->thread_info->localServerDataBase.release_old_address = true;
-
     //  /* XXX Is short_src_adr ever reset? Is it undefined if info not in msg? */
     tr_debug("Route seq %d Router mask: %s", routeId, trace_array(router_mask_ptr, 8));
     cur->thread_info->routing.router_id_sequence_valid = false;