[Bug tapsets/23799] sprint_ustack() returns empty strings while sprint_ubacktrace() does not

[agentzh at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=23799

--- Comment #2 from agentzh <agentzh at gmail dot com> ---
Using `print_ustack(ubacktrace())` works:

```
$ stap -e 'probe process.function("foo") { print_ustack(ubacktrace()); }' -c
./a.out --ldd
 0x40048b : foo+0x4/0xb [/mnt/home/agentzh/git/ylang/a.out]
 0x40049b : bar+0x9/0xb [/mnt/home/agentzh/git/ylang/a.out]
 0x4004a6 : main+0x9/0x13 [/mnt/home/agentzh/git/ylang/a.out]
 0x7f3e87d0ffea : __libc_start_main+0xea/0x1c0 [/usr/lib64/libc-2.26.so]
 0x4003da : _start+0x2a/0x30 [/mnt/home/agentzh/git/ylang/a.out]
```

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