Fixed raising OSError in _safe_read when size is greater than SAFEBLOCK #5872
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Resolves #5871
I have contrived a test so that BmpImagePlugin will try to call
ImageFile._safe_readwith asizegreater thanImageFile.SAFEBLOCKon a truncated file.Without this PR, a truncation error is not raised as advertised.
With this PR, it is.