Fix Using pretty tests and remove semicolon on single-line if.

ICSharpCode.Decompiler.Tests/TestCases/Pretty/Using.cs

@@ -58,7 +58,7 @@ namespace ICSharpCode.Decompiler.Tests.TestCases.Pretty
 		public void SimpleUsingExpressionStatementWithDeclaration()
 		{
 			using (MemoryStream memoryStream = new MemoryStream()) {
-				memoryStream.WriteByte((byte)42);
+				memoryStream.WriteByte(42);
 				Console.WriteLine("using-body: " + memoryStream.Position);
 			}
 		}

ICSharpCode.Decompiler/IL/Transforms/InlineReturnTransform.cs

@@ -39,7 +39,7 @@ namespace ICSharpCode.Decompiler.IL.Transforms
 				if (!leave.Value.MatchLdLoc(out var returnVar) || returnVar.Kind != VariableKind.Local)
 					continue;
 				// If all instructions can be modified, add item to the global list.
-				if (CanModifyInstructions(returnVar, leaveBlock, out var list));
+				if (CanModifyInstructions(returnVar, leaveBlock, out var list))
 					instructionsToModify.AddRange(list);
 			}