multiplex_pucch_resource() may run in infinite loop

We checked, it looks a direct C language transcription of the standard, but

bool overlap = check_overlapping_resources(curr_start, curr_length, next_start, next_length);

can return false when j < num_res - 1 in this case, j and o don't change when we loop, so overlap will be false again => infinite loop

we observed several times, but no known way to replicate this bug