Use >= to compare.

Author: JimBobSquarePants

src/ImageSharp/Formats/Png/PngDecoderCore.cs

@@ -208,7 +208,7 @@ public Image<TPixel> Decode<TPixel>(BufferedReadStream stream, CancellationToken
  currentFrameControl = this.ReadFrameControlChunk(chunk.Data.GetSpan());
  break;
  case PngChunkType.FrameData:
- if (frameCount == this.maxFrames)
+ if (frameCount >= this.maxFrames)
  {
  goto EOF;
  }
@@ -266,7 +266,7 @@ public Image<TPixel> Decode<TPixel>(BufferedReadStream stream, CancellationToken
  previousFrameControl = currentFrameControl;
  }
 
- if (frameCount == this.maxFrames)
+ if (frameCount >= this.maxFrames)
  {
  goto EOF;
  }
@@ -389,15 +389,15 @@ public ImageInfo Identify(BufferedReadStream stream, CancellationToken cancellat
  break;
  case PngChunkType.FrameControl:
  ++frameCount;
- if (frameCount == this.maxFrames)
+ if (frameCount >= this.maxFrames)
  {
  break;
  }
 
  lastFrameControl = this.ReadFrameControlChunk(chunk.Data.GetSpan());
  break;
  case PngChunkType.FrameData:
- if (frameCount == this.maxFrames)
+ if (frameCount >= this.maxFrames)
  {
  break;
  }