Goertzel in filters.cxx

[ghost]

Line 536:

return ((k2*Q1)/N);

Should be:

return ((k2*Q2)/N);

According to several other implementations.

[jamescoxon]

Thanks k5okc for bring this up - looking at the lastest FLdigi source they haven't changed anything. I'll need to do a bit more investigation into this (filters aren't really my area) and it might be perhaps something that needs to be submitted upstream rather then just for dl-fldigi