tests: allfcts.c (main): Correct dwarf_getfuncs return value check.

The return value of dwarf_getfuncs is a ptrdiff_t that is zero on success,
or non-zero (an offset to continue the search) when the callback returned
DWARF_CB_ABORT or on error. When an error occurs dwarf_errno is set.

Signed-off-by: Mark Wielaard <mjw@redhat.com>
2 files changed