demangle_datatype: delete superflous free().

diff --git a/tools/winedump/msmangle.c b/tools/winedump/msmangle.c
index 7893bcf..cbe89ac 100644
--- a/tools/winedump/msmangle.c
+++ b/tools/winedump/msmangle.c
@@ -529,7 +529,6 @@
 	      } else while (*iter == '@') iter++;
 	      iter++;
 	      ct->expression = str_create(2, ct->expression, ")");
-	      FREE_CT (sub_ct);
 	  }
 	  else
 	      return NULL;