Practracker --list-overbroad produces confusing output when there is an exception

connection_control_process_inbuf() is 115 lines long, but the exceptions file says it should be 113.

This line is spurious and should not appear in the output:

problem function-size /src/feature/control/control.c:connection_control_process_inbuf() 113 -> 0

Ideally, practracker should log a message that there are no over-broad exceptions, but there are violations.

Here is the full output:

$ scripts/maint/practracker/practracker.py --list-overbroad
problem function-size /src/feature/control/control.c:connection_control_process_inbuf() 115
FAILURE: practracker found 1 new problem(s) in the code: see warnings above.

Please fix the problems if you can, and update the exceptions file
(./scripts/maint/practracker/./exceptions.txt) if you can't.

See doc/HACKING/HelpfulTools.md for more information on using practracker.
You can disable this message by setting the TOR_DISABLE_PRACTRACKER environment
variable.

problem function-size /src/feature/control/control.c:connection_control_process_inbuf() 113 -> 0
Exit 1