strange -L (tape-length) handling

[Russ Trotter]

Hello,

  for tar-1.13, Looking at tar.c line 657, the test for the return code
for xstrtoul looks supsicious.  Examining the the code for lib/xstrtol.c
indicates that the function never can return LONG_MAX.  It seems the
test should testing the return code != LONGINT_OK or something like
that.

  I noticed this problem trying to compile a version with a tiny patch
to an unrelated option.

  is there something I'm missing?

russ