Merge pull request #1393 from onevcat/fix/issue-1392

Remove unused variable

Sources/Image/ImageDrawing.swift

@@ -281,7 +281,6 @@ extension KingfisherWrapper where Base: KFCrossPlatformImage {
         
         let w = Int(size.width)
         let h = Int(size.height)
-        let rowBytes = Int(CGFloat(cgImage.bytesPerRow))
         
         func createEffectBuffer(_ context: CGContext) -> vImage_Buffer {
             let data = context.data