FROMLIST: gendwarfksyms: Fix structure type overrides

As we always iterate through the entire die_map when expanding
type strings, recursively processing referenced types in
type_expand_child() is not actually necessary. Furthermore,
the type_string kABI rule added in commit c9083467
("gendwarfksyms: Add a kABI rule to override type strings") can
fail to override type strings for structures due to a missing
kabi_get_type_string() check in this function.

Fix the issue by dropping the unnecessary recursion and moving
the override check to type_expand(). Note that symbol versions
are otherwise unchanged with this patch.

Fixes: c9083467 ("gendwarfksyms: Add a kABI rule to override type strings")
Reported-by: Giuliano Procida <gprocida@google.com>
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>

Bug: 400972353
Link: https://lore.kernel.org/lkml/20250609154926.1237033-2-samitolvanen@google.com/


Change-Id: Iad5959260b5bfc51f700783e547815485d1683a4
Signed-off-by: Giuliano Procida <gprocida@google.com>