Fix Tamper Machine crash and timings (#2159)

* Add missing return

* Change TamperMachine sleep to 83ms

* Change constant name to PascalCase

Ryujinx.HLE/HOS/ModLoader.cs

@@ -630,6 +630,8 @@ namespace Ryujinx.HLE.HOS
             if (tamperInfo == null || tamperInfo.BuildIds == null || tamperInfo.CodeAddresses == null)
             {
                 Logger.Error?.Print(LogClass.ModLoader, "Unable to install cheat because the associated process is invalid");
+
+                return;
             }
 
             Logger.Info?.Print(LogClass.ModLoader, $"Build ids found for title {titleId:X16}:\n    {String.Join("\n    ", tamperInfo.BuildIds)}");

Ryujinx.HLE/HOS/TamperMachine.cs

@@ -13,6 +13,10 @@ namespace Ryujinx.HLE.HOS
 {
     public class TamperMachine
     {
+        // Atmosphere specifies a delay of 83 milliseconds between the execution of the last
+        // cheat and the re-execution of the first one.
+        private const int TamperMachineSleepMs = 1000 / 12;
+
         private Thread _tamperThread = null;
         private ConcurrentQueue<ITamperProgram> _programs = new ConcurrentQueue<ITamperProgram>();
         private long _pressedKeys = 0;
@@ -76,7 +80,7 @@ namespace Ryujinx.HLE.HOS
                 if (sleepCounter == 0)
                 {
                     sleepCounter = _programs.Count;
-                    Thread.Sleep(1);
+                    Thread.Sleep(TamperMachineSleepMs);
                 }
                 else
                 {