[net processing] Tidy up Misbehaving()

- Make const things const.
- Replace conditional return with assert.
- Don't log the peer's IP address.
- Log the name Misbehaving directly instead of relying on __func__.

Author: jnewbery

src/net_processing.cpp

@@ -1059,23 +1059,22 @@ unsigned int LimitOrphanTxSize(unsigned int nMaxOrphans)
  * Increment peer's misbehavior score. If the new value >= DISCOURAGEMENT_THRESHOLD, mark the node
  * to be discouraged, meaning the peer might be disconnected and added to the discouragement filter.
  */
-void Misbehaving(NodeId pnode, int howmuch, const std::string& message) EXCLUSIVE_LOCKS_REQUIRED(cs_main)
+void Misbehaving(const NodeId pnode, const int howmuch, const std::string& message) EXCLUSIVE_LOCKS_REQUIRED(cs_main)
 {
-    if (howmuch == 0)
-        return;
+    assert(howmuch > 0);
 
-    CNodeState *state = State(pnode);
-    if (state == nullptr)
-        return;
+    CNodeState* const state = State(pnode);
+    if (state == nullptr) return;
 
     state->nMisbehavior += howmuch;
-    std::string message_prefixed = message.empty() ? "" : (": " + message);
+    const std::string message_prefixed = message.empty() ? "" : (": " + message);
     if (state->nMisbehavior >= DISCOURAGEMENT_THRESHOLD && state->nMisbehavior - howmuch < DISCOURAGEMENT_THRESHOLD)
     {
-        LogPrint(BCLog::NET, "%s: %s peer=%d (%d -> %d) DISCOURAGE THRESHOLD EXCEEDED%s\n", __func__, state->name, pnode, state->nMisbehavior-howmuch, state->nMisbehavior, message_prefixed);
+        LogPrint(BCLog::NET, "Misbehaving: peer=%d (%d -> %d) DISCOURAGE THRESHOLD EXCEEDED%s\n", pnode, state->nMisbehavior - howmuch, state->nMisbehavior, message_prefixed);
         state->m_should_discourage = true;
-    } else
-        LogPrint(BCLog::NET, "%s: %s peer=%d (%d -> %d)%s\n", __func__, state->name, pnode, state->nMisbehavior-howmuch, state->nMisbehavior, message_prefixed);
+    } else {
+        LogPrint(BCLog::NET, "Misbehaving: peer=%d (%d -> %d)%s\n", pnode, state->nMisbehavior - howmuch, state->nMisbehavior, message_prefixed);
+    }
 }
 
 /**