The p return value from Bitmap.FromUnsafeBytes is incorrect

[anacrolix]

The p return value from Bitmap.FromUnsafeBytes is incorrect and untested.

I experimented with using it to read consecutive packed bitmaps for the BSI implementation but it resulted in different p values than ReadFrom. I took a quick look at the tests and it wasn't checked in the unit tests when the feature was added.

@damnever

[lemire]

@anacrolix

The p return value from Bitmap.FromUnsafeBytes is incorrect

Please provide evidence. A simple example would suffice.

I strongly discourage such vague statements.

untested

I have added a test. Note that the function is made of two lines of code.

	stream := internal.NewByteBuffer(data)
	return rb.ReadFrom(stream)