[erts] Fix crash on reception of fragmentated message to unaliased pr…

…ocess

erts/emulator/beam/erl_proc_sig_queue.c

@@ -5436,8 +5436,6 @@ handle_alias_message(Process *c_p, ErtsMessage *sig, ErtsMessage ***next_nm_sig)
     ASSERT(is_internal_pid(from) || is_atom(from));
     ASSERT(is_internal_pid_ref(alias));
 
-    ERL_MESSAGE_FROM(sig) = from;
-
     mon = erts_monitor_tree_lookup(ERTS_P_MONITORS(c_p), alias);
     flags = mon ? mon->flags : (Uint16) 0;
     if (!(flags & ERTS_ML_STATE_ALIAS_MASK)
@@ -5447,17 +5445,13 @@ handle_alias_message(Process *c_p, ErtsMessage *sig, ErtsMessage ***next_nm_sig)
          * drop message...
          */
         remove_nm_sig(c_p, sig, next_nm_sig);
-        /* restored as message... */
-        ERL_MESSAGE_TERM(sig) = msg;
-        if (type == ERTS_SIG_Q_TYPE_DIST)
-            sig->data.heap_frag = &sig->hfrag;
-        else
-            sig->data.attached = data_attached;
         sig->next = NULL;;
         erts_cleanup_messages(sig);
         return 2;
     }
 
+    ERL_MESSAGE_FROM(sig) = from;
+
     if ((flags & ERTS_ML_STATE_ALIAS_MASK) == ERTS_ML_STATE_ALIAS_ONCE) {
         mon->flags &= ~ERTS_ML_STATE_ALIAS_MASK;