get_current_lrr reads invalid memory

[wphilips]

get_current_llr reads outside of the array bounds of dvbs2_modcode_for_llr_x100
and dvbs1_modcode_for_llr_x100.

The if tests allow readin an element past the end of the arrays. I have seen tis actually happening on
a dvbs1 transponder. Also, it can happen that the code does not set *current_llr at all, in which case
it will use the last stored value, which can also be wrong.

[wphilips]

llr_patch.txt
Patch for this issue