a few warnings

[Ben Pfaff]

I've been working to fix some of the warnings I get from the
source tree right now.  Most of them have obvious fixes.  One I'm
not sure about:

../src/math/linreg/coefficient.c: In function 'pspp_linreg_coeff_get_value':
../src/math/linreg/coefficient.c:167: warning: comparison between pointer and 
integer

This is for:
  if (v->type == NULL)
where `v' is of type `struct variable *'.  I don't understand
what the `if' statement wants to test.

-- 
On Perl: "It's as if H.P. Lovecraft, returned from the dead and speaking by
seance to Larry Wall, designed a language both elegant and terrifying for his
Elder Things to write programs in, and forgot that the Shoggoths didn't turn
out quite so well in the long run." --Matt Olson