Suggestion for smime.c

[Ken Hirsch]

There is a known issue about the input to "smime -sign" being a pipe.  Can
smime.c be changed so that it gives an error when it tries to rewind the
input?  Something like:
  if (BIO_reset(in) != 0 && (flags & PKCS7_DETACHED)) {
    BIO_printf(bio_err, "Can't rewind input file\n");
    goto end;
  }
(Diff w.r.t 0.9.6d-beta1 is attached)
This would have saved me some time tracking down the problem.

Thanks,
Ken Hirsch

smime.c.diff
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