crates/jpeg: Fix some errors from #148 (comment)

Only one left that's causing a panic, I should probably hardcode that as a hard error if I can't fix

crates/zune-jpeg/src/components.rs

@@ -200,8 +200,7 @@ impl SampleRatios {
     pub fn sample(self) -> usize {
         match self {
             SampleRatios::HV => 4,
-            SampleRatios::V => 2,
-            SampleRatios::H => 2,
+            SampleRatios::V | SampleRatios::H => 2,
             SampleRatios::None => 1
         }
     }

crates/zune-jpeg/src/headers.rs

@@ -431,6 +431,7 @@ pub(crate) fn parse_app14<T: ZReaderTrait>(
         decoder.stream.skip(5);
         // get color transform
         let transform = decoder.stream.get_u8();
+        // https://exiftool.org/TagNames/JPEG.html#Adobe
         match transform {
             0 => decoder.input_colorspace = ColorSpace::CMYK,
             1 => decoder.input_colorspace = ColorSpace::YCbCr,

crates/zune-jpeg/src/mcu.rs

@@ -206,7 +206,9 @@ impl<T: ZReaderTrait> JpegDecoder<T> {
                 &mut upsampler_scratch_space
             )?;
         }
-        assert_eq!(pixels_written, pixels.len());
+        // it may happen that some images don't have the whole buffer
+        // so we can't panic in case of that
+        // assert_eq!(pixels_written, pixels.len());
 
         trace!("Finished decoding image");