[mythtv] Ticket #4506: Reduce logging for rotor users

[Nigel Pearson]

> Daniel, with this we're not so much removing any debugging but  
> simply checking the flag before adding it.

What logging is output if the flag is
already set when the code sets it (again)?

(i.e. what is this fixing?)

--
Nigel Pearson, nigel at ind.tansu.com.au|  4  8
Telstra Net. Eng., Sydney, Australia | 15 16
Office: 9202 3900    Fax:  9261 3912 | 23 42
Mobile: 0408 664435  Home: 9792 6998 |  Lost