gdb/python: do not hold on gdb.Type object from gdb.Value

Previous commit changed type_to_type_object() so each time it is
called with particular struct value* it returns the same object.

Therefore there's no longer need to hold on type objects (gdb.Type)
from struct value_object in order to preserve identity of gdb.Type
objects held in value_object::type and value_object::dynamic_type
members. This in turn allowed for some simplification in various
functions.

While at it I changed a couple of NULLs to nullptrs.

Approved-By: Tom Tromey <tom@tromey.com>

0 files changed, 0 insertions, 0 deletions