Uninitialized format in error_test

[yugr]

error_value_test function in error_test.c does not zero-initialize sfinfo.format field before passing it to sf_open:

SF_INFO sfinfo ;
...
file = sf_open (filename, SFM_READ, &sfinfo) ;

This later triggeres uninitialized read in psf_open_file:

if (psf->file.mode == SFM_READ)
{	if ((SF_CONTAINER (sfinfo->format)) == SF_FORMAT_RAW)

Valgrind report is

==22949== Conditional jump or move depends on uninitialised value(s)
==22949==    at 0x524E82D: psf_open_file (/build/libsndfile-1.0.25/src/sndfile.c:2591)
==22949==    by 0x40186E: error_value_test (/build/libsndfile-1.0.25/tests/error_test.c:86)
==22949==    by 0x40186E: main (/build/libsndfile-1.0.25/tests/error_test.c:236)

The issue has been found using Valgrind and debian_pkg_test.

[erikd]

Thanks!