Repo.blob: respect reported blob size

Batch output of git-cat-file has the form:

    <sha1> SP <type> SP <size> LF <contents> LF

It unconditionally includes a trailing line-feed which Repo.blob()
incorrectly returns as part of blob content. For textual blobs, this
extra character is often benign, however, for binary blobs, it can
easily change the meaning of the data in unexpected or disastrous ways.
Fix this by respecting the blob size reported by git-cat-file.

(The alternate approach of unconditionally dropping the final LF also
works, however, respecting the reported size is perhaps a bit more
robust and "correct".)

Signed-off-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Alberto Bertogli <albertito@blitiri.com.ar>

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