BUG: Fix crashes by removing unnecessary line (#3293)

Closes #3292.

Author: larsga

pypdf/_doc_common.py

@@ -422,7 +422,6 @@ def get_named_dest_root(self) -> ArrayObject:
             self.root_object[CA.NAMES], DictionaryObject
         ):
             names = cast(DictionaryObject, self.root_object[CA.NAMES])
-            names_ref = names.indirect_reference
             if CA.DESTS in names and isinstance(names[CA.DESTS], DictionaryObject):
                 # §3.6.3 Name Dictionary (PDF spec 1.7)
                 dests = cast(DictionaryObject, names[CA.DESTS])