perf annotate-data: Fix libdw API contract violations

perf annotate-data: Fix libdw API contract violations

Check return values of `dwarf_aggregate_size` and `dwarf_formudata`.

Additionally:
 - Avoid `vfprintf` undefined behavior with `NULL` strings by using
   the `die_name()` helper for `dwarf_diename()` in `pr_*` calls.
 - Use `die_get_data_member_location()` (updated to use
   `dwarf_attr_integrate`) to correctly parse location expressions
   for inherited member locations in the fallback path when
   `dwarf_formudata()` fails.

Fixes: 2bc3cf575a162a2c ("perf annotate-data: Improve debug message with location info")
Fixes: 4a111cadac85362e ("perf annotate-data: Add member field in the data type")
Fixes: 8b1042c425f6a5a9 ("perf annotate-data: Set bitfield member offset and size properly")
Fixes: fc044c53b99fad03 ("perf annotate-data: Add dso->data_types tree")
Assisted-by: Gemini-CLI:Google Gemini 3
Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@linaro.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Zecheng Li <zli94@ncsu.edu>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>