Fix unnecessary allocations

Author: Vincent Wilms

src/PureHDF.SourceGenerator/PureHDF.SourceGenerator.sln

@@ -238,8 +238,6 @@ private Memory<byte> ReadChunk(
                 chunk = GC
                     .AllocateUninitializedArray<byte>((int)ChunkByteSize);
 
-                chunk = new byte[(int)ChunkByteSize];
-
                 chunk.Span.Fill(Dataset.FillValue.Value);
             }
         }
@@ -260,8 +258,6 @@ private Memory<byte> ReadChunk(
                     chunk = GC
                         .AllocateUninitializedArray<byte>((int)ChunkByteSize);
 
-                    chunk = new byte[(int)ChunkByteSize];
-
                     chunk.Span.Fill(Dataset.FillValue.Value);
                 }
             }

src/PureHDF/VOL/Native/H5D/H5D_Chunk.cs

@@ -12,8 +12,8 @@ public void WriteAndReadOpaqueDataset()
         var expected = new byte[] { 0x01, 0x02, 0x13 };
 
         h5FileWrite["test"] = new H5Dataset(
-            data: expected, 
-            opaqueInfo: new H5OpaqueInfo((uint) expected.Length, "New")
+            data: expected,
+            opaqueInfo: new H5OpaqueInfo((uint)expected.Length, "New")
         );
 
         var memoryStream = new MemoryStream();