Fix multiple death messages (#5305)

Fix multiple death messages (#3565) and damage server logs after death.

src/content_sao.cpp

@@ -919,8 +919,8 @@ void PlayerSAO::step(float dtime, bool send_recommended)
 		MapNode n = m_env->getMap().getNodeNoEx(p);
 		const ContentFeatures &c = m_env->getGameDef()->ndef()->get(n);
 		// If node generates drown
-		if (c.drowning > 0) {
+		if (c.drowning > 0 && m_hp > 0) {
-			if (m_hp > 0 && m_breath > 0)
+			if (m_breath > 0)
 				setBreath(m_breath - 1);
 
 			// No more breath, damage player

src/network/serverpackethandler.cpp

@@ -1107,6 +1107,13 @@ void Server::handleCommand_Damage(NetworkPacket* pkt)
 	}
 
 	if (g_settings->getBool("enable_damage")) {
+		if (playerSAO->isDead()) {
+			verbosestream << "Server::ProcessData(): Info: "
+				"Ignoring damage as player " << player->getName()
+				<< " is already dead." << std::endl;
+			return;
+		}
+
 		actionstream << player->getName() << " damaged by "
 				<< (int)damage << " hp at " << PP(playersao->getBasePosition() / BS)
 				<< std::endl;

src/server.cpp

@@ -1111,16 +1111,15 @@ PlayerSAO* Server::StageTwoClientInit(u16 peer_id)
 	// Send inventory
 	SendInventory(playersao);
 
-	// Send HP
+	// Send HP or death screen
-	SendPlayerHPOrDie(playersao);
+	if (playersao->isDead())
+		SendDeathscreen(peer_id, false, v3f(0,0,0));
+	else
+		SendPlayerHPOrDie(playersao);
 
 	// Send Breath
 	SendPlayerBreath(playersao);
 
-	// Show death screen if necessary
-	if (playersao->isDead())
-		SendDeathscreen(peer_id, false, v3f(0,0,0));
-
 	// Note things in chat if not in simple singleplayer mode
 	if (!m_simple_singleplayer_mode && g_settings->getBool("show_statusline_on_connect")) {
 		// Send information about server to player in chat