[pvr.dvblink] Version 1.9.11

Updated: Fixed crash when switching channels with enabled timeshifting

Please include it into Kodi final. It is a very important fix of the crash condition.

Thank you.
Hm, No, not really. The crash happens because because server returns 0 for all three parameters - length, cur_pos and duration, which is perfectly ok in the beginning. 
But checking for cur_pos >= length does not guarantee no crash situation. So to be on the safe side we do the check for the actual error condition (division by zero in situation (0-0)/0).