io/ompio: file file_seek calculation - v5.0.x #13026
                
     Merged
            
            
          
      
        
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fix the file_seek calculations when using SEEK_END. Thanks @tukss for reporting the issue.
Fixes #12952
(note: some minor changes were required compared to the main PR to handle differences in the code base)
Signed-off-by: Edgar Gabriel [email protected]
(cherry picked from commit d82d905)