new warnings

[Ben Pfaff]

I see some new warnings on master.  This one looks serious:

src/data/ods-reader.c: In function ‘ods_open_reader’:
src/data/ods-reader.c:596: error: passing argument 1 of 
‘ods_file_casereader_destroy’ from incompatible pointer type
src/data/ods-reader.c:120: note: expected ‘struct casereader *’ but argument is 
of type ‘struct zip_reader *’

This one seems probably less serious:

src/language/stats/factor.c: In function ‘idata_free’:
src/language/stats/factor.c:209: error: passing argument 1 of ‘gsl_matrix_free’ 
discards qualifiers from pointer target type
/usr/include/gsl/gsl_matrix_double.h:96: note: expected ‘struct gsl_matrix *’ 
but argument is of type ‘const struct gsl_matrix *’

Thanks,

Ben.