further reduce memory leaks from parse errors (bug #40231) * oct-parse.in.yy (colon_expr1): Delete operands on error. (function1, jump_command): No need to check for errors. (expression): Delete simple_expr on error. (return_list): Delete parameter list on error. (octave_base_parser::make_unwind_command, octave_base_parser::make_try_command, octave_base_parser::make_while_command, octave_base_parser::make_for_command, octave_base_parser::finish_if_command, octave_base_parser::finish_switch_command, octave_base_parser::make_index_expression): Delete component parse tree elements on error.

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