Tiny cleanup (#1098)

Robust.Client/Audio/Midi/MidiRenderer.cs

@@ -527,7 +527,7 @@ namespace Robust.Client.Audio.Midi
                             break;
                     }
             }
-            catch (FluidSynthInteropException e)
+            catch (FluidSynthInteropException)
             {
                 // This spams NoteOff errors most of the time for no good reason.
                 //_midiSawmill.Error("Exception while sending midi event of type {0}: {1}", midiEvent.Type, e, midiEvent);

Robust.Client/Physics/PhysicsSystem.cs

@@ -8,8 +8,6 @@ namespace Robust.Client.Physics
     [UsedImplicitly]
     public class PhysicsSystem: EntitySystem
     {
-        private float _lastServerMsg;
-
         public override void Initialize()
         {
             base.Initialize();