[lldb] Replace condition that always evaluates to false (#89685)

Addresses issue #87243.

The current code incorrectly checks the validity of ```obj``` twice when
it should be checking the new ```str_obj``` pointer.

Signed-off-by: Troy-Butler <squintik@outlook.com>
Co-authored-by: Troy-Butler <squintik@outlook.com>
GitOrigin-RevId: af8445e9ce4d9bd74775a68b694957640f29d28a
1 file changed