syslog: fix segfault in syslog_parse_priority()
    
    (cherry picked from commit a5ee33b951cfa22db53d0274c9c6c0d9d4dae39d)
    
    Resolves: #1761519
    
    patch_name: 0221-syslog-fix-segfault-in-syslog_parse_priority.patch
    present_in_specfile: true
    location_in_specfile: 221
    squash_commits: true