Fix 64-bit build-using admins not being able to kick players besides themselves, by not checking sendingsavegame[] code at all if not the server

it turns out playernode[pn] is typically 255 in the above situation, so sendingsavegame[playernode[pn]] goes out of bounds ...but goodness knows why 32-bit builds didn't suffer the same bug, seems to have been pure luck

src/d_clisrv.c

@@ -2650,13 +2650,16 @@ static void Command_Kick(void)
 		if (pn == -1 || pn == 0)
 			return;
 
-		// Special case if we are trying to kick a player who is downloading the game state:
+		if (server)
-		// trigger a timeout instead of kicking them, because a kick would only
-		// take effect after they have finished downloading
-		if (sendingsavegame[playernode[pn]])
 		{
-			Net_ConnectionTimeout(playernode[pn]);
+			// Special case if we are trying to kick a player who is downloading the game state:
-			return;
+			// trigger a timeout instead of kicking them, because a kick would only
+			// take effect after they have finished downloading
+			if (sendingsavegame[playernode[pn]])
+			{
+				Net_ConnectionTimeout(playernode[pn]);
+				return;
+			}
 		}
 
 		WRITESINT8(p, pn);