Fix: change_index wasn't being cleared by deallocate.

git-svn-id: https://protobuf-c.googlecode.com/svn/trunk@235 00440858-1255-0410-a3e6-75ea37f81c3a

src/google/protobuf-c/protobuf-c-dispatch.c

@@ -377,6 +377,7 @@ deallocate_change_index (RealDispatch *d,
   unsigned ch_ind = fm->change_index;
   unsigned from = d->base.n_changes - 1;
   ProtobufC_FD from_fd;
+  fm->change_index = -1;
   if (ch_ind == from)
     {
       d->base.n_changes--;