[utils] Fix utils/demangle_tree.py:parse_line to correctly check for closing parenthesis #142153
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Previously, parse_line incorrectly repeated the check for open_paren instead of verifying the presence of a closing parenthesis. This caused inputs with an unmatched opening parenthesis to be parsed incorrectly.
For example:
print(parse_line('?foo (bar'))
→ before: ('?foo', 'ba') [incorrect]
→ after: (None, None) [correct]
Fixed the condition to properly check close_paren.