Adjust exit codes of remaining test cases (fixes build)

ICSharpCode.Decompiler/Tests/TestCases/ControlFlow.cs

@@ -34,7 +34,8 @@ class ControlFlow
 		NormalIf3("test", ref result);
 		Test("none", ref result);
 		Test("test", ref result);
-		return result;
+		Console.WriteLine(result);
+		return 0;
 	}
 
 	static void EmptyIf(string input, ref int result)

ICSharpCode.Decompiler/Tests/TestCases/InitializerTests.cs

@@ -27,7 +27,9 @@ public class InitializerTests
 		test[0,0] = 0;
 		test[0,1] = 1;
 		test[0,2] = 2;
-		return test.Length + test[0, 0] + test[0, 2];
+		int result = test.Length + test[0, 0] + test[0, 2];
+		Console.WriteLine(result);
+		return 0;
 	}
 	
 	private enum MyEnum

ICSharpCode.Decompiler/Tests/TestCases/PropertiesAndEvents.cs

@@ -17,7 +17,7 @@ namespace PropertiesAndEvents
 			i[1] = 2;
 			Console.WriteLine("{0} {1}", i[0], i[5]);
 			Console.WriteLine("PI² = {0}", i.PISquare);
-			return -1;
+			return 0;
 		}
 	}