[bug #61144] [refer] bad validation of list in indexed biblography file

[G. Branden Robinson]

Update of bug #61144 (project groff):

                  Status:             In Progress => Fixed                  
             Open/Closed:                    Open => Closed                 
         Planned Release:                    None => 1.23.0                 

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Follow-up Comment #1:


commit 3f94abf4072e46f1f2e434a0b3582961113991af
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
Date:   Sun Sep 12 05:30:07 2021 +1000

    [libbib]: Stop throwing spurious diagnostic.
    
    * src/libs/libbib/index.cpp (index_search_item::get_invalidity_reason):
      Don't complain about about a last list element being nonnegative if
      the list size was zero in the first place, as can happen with an empty
      index.  More seriously from a language standpoint, avoid reading
      through a negative array index (this can escape a compiler's attention
      because we're reading from the midst of a heap-allocated or `mmap()`ed
      region, but it's still a code smell).
    
    Fixes <https://savannah.gnu.org/bugs/?61144>.


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