[Bug libbacktrace/88063] Libbacktrace leak on dwarf read failure

[vries at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88063

--- Comment #6 from Tom de Vries <vries at gcc dot gnu.org> ---
Created attachment 45055
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=45055&action=edit
Updated patch