Polish benchmarks (fix new warnings)

tests/ImageSharp.Benchmarks/Codecs/Jpeg/CmykColorConversion.cs

@@ -1,4 +1,7 @@
-using BenchmarkDotNet.Attributes;
+// Copyright (c) Six Labors.
+// Licensed under the Apache License, Version 2.0.
+
+using BenchmarkDotNet.Attributes;
 using SixLabors.ImageSharp.Formats.Jpeg.Components.Decoder.ColorConverters;
 
 namespace SixLabors.ImageSharp.Benchmarks.Codecs.Jpeg

tests/ImageSharp.Benchmarks/Codecs/Jpeg/ColorConversionBenchmark.cs

@@ -1,4 +1,7 @@
-using System;
+// Copyright (c) Six Labors.
+// Licensed under the Apache License, Version 2.0.
+
+using System;
 using System.Numerics;
 using BenchmarkDotNet.Attributes;
 using SixLabors.ImageSharp.Memory;
@@ -21,7 +24,7 @@ namespace SixLabors.ImageSharp.Benchmarks.Codecs.Jpeg
         [GlobalSetup]
         public void Setup()
         {
-            this.input = CreateRandomValues(componentCount, Count);
+            this.input = CreateRandomValues(this.componentCount, Count);
             this.output = new Vector4[Count];
         }
 

tests/ImageSharp.Benchmarks/Codecs/Jpeg/GrayscaleColorConversion.cs

@@ -1,4 +1,7 @@
-using BenchmarkDotNet.Attributes;
+// Copyright (c) Six Labors.
+// Licensed under the Apache License, Version 2.0.
+
+using BenchmarkDotNet.Attributes;
 using SixLabors.ImageSharp.Formats.Jpeg.Components.Decoder.ColorConverters;
 
 namespace SixLabors.ImageSharp.Benchmarks.Codecs.Jpeg

tests/ImageSharp.Benchmarks/Codecs/Jpeg/RgbColorConversion.cs

@@ -1,4 +1,7 @@
-using BenchmarkDotNet.Attributes;
+// Copyright (c) Six Labors.
+// Licensed under the Apache License, Version 2.0.
+
+using BenchmarkDotNet.Attributes;
 using SixLabors.ImageSharp.Formats.Jpeg.Components.Decoder.ColorConverters;
 
 namespace SixLabors.ImageSharp.Benchmarks.Codecs.Jpeg

tests/ImageSharp.Benchmarks/Codecs/Jpeg/YccKColorConverter.cs

@@ -1,4 +1,7 @@
-using BenchmarkDotNet.Attributes;
+// Copyright (c) Six Labors.
+// Licensed under the Apache License, Version 2.0.
+
+using BenchmarkDotNet.Attributes;
 using SixLabors.ImageSharp.Formats.Jpeg.Components.Decoder.ColorConverters;
 
 namespace SixLabors.ImageSharp.Benchmarks.Codecs.Jpeg