RFR: 8263560: Remove needless wrapping with BufferedInputStream [v4]

[Alan Bateman]

On Sun, 14 Mar 2021 19:32:11 GMT, Сергей Цыпанов <github.com+10835776+stsypanov at openjdk.org> wrote:

> Done

I think I'd prefer if the exception message would say that the JMOD is invalid or that the JMOD file is truncated (because I don't think anyone seeing this exception will know anything about the header).

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PR: https://git.openjdk.java.net/jdk/pull/2992