Hi,

the uncorrected block count is reset on a read request for the tda10021 and stv0297. This 
makes the UNC value of the femon plugin useless. The attached patch will fix this issue. 
It is simple for the stv0297. For the tda10021, the uncorrected block count must be read 
cyclical, because the resolution of the counter is very low. This can be done within 
tda10021_read_status. The read-status-function is called cyclical from the frontend-thread.

Some other frontends have the same problem (tda10023, ves1820, ves1x93, ...).

-Hartmut