[RFA/DWARF] do not use dwarf2_per_objfile in dwarf2_per_objfile_free.

[Tom Tromey]

>>>>> "Joel" == Joel Brobecker <brobecker@adacore.com> writes:

Joel>         * dwarf2read.c (dwarf2_per_objfile): Replace uses of
Joel>         DWARF2_PER_OBJFILE by uses of DATA instead.

This is ok.

You could consider setting 'dwarf2_per_objfile = NULL' at the start of
the function, to try to prevent future bugs along these lines.

Tom