[Bug 204230] [patch] bsdiff(1) - check file size against SIZE_MAX

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=204230

--- Comment #3 from Andrey A. Chernov <ache at FreeBSD.org> ---
Comment on attachment 162714
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=162714
proposed fix

This fix is not pretty. 
1) It does not set errno (EFBIG)
2) Next overflow is few lines below:
if(((I=malloc((oldsize+1)*sizeof(off_t)))==NULL) ||
    ((V=malloc((oldsize+1)*sizeof(off_t)))==NULL)) err(1,NULL);

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