[Bug-gsl] Erroneous use of GSL_ERROR_NULL instead of GSL_ERROR macro

[Matthias Sitte]

Hi list,

in reference to my previous email I dug through the whole code base, checking
each function that the 'git grep -n -p "GSL_ERROR_NULL"' returned.  Thankfully,
only a couple of more functions turned up which use GSL_ERROR_NULL instead of
GSL_ERROR. Although this might not seem relevant at first, remember that
GSL_SUCCESS equals to 0 as does NULL returned by GSL_ERROR_NULL, so there's no
way of knowing that those functions might fail if you use a custom error handler
which doesn't automatically abort.

Anyway, patch attached. If you prefer pull requests instead, let me know.

Cheers,

  Matthias

fix_erroneous_use_of_gsl_error_null_macro.patch
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