clang 7 build failed

[smartnet-club]

include/kfr/dsp/goertzel.hpp:99:16: error: flexible array member 'result' with type 'complex<T> []' is not at the end of struct complex<T> result[];

should be:

...
    vec<T, width> q2;
    complex<T> result[];
};

[kgupta15]

Had this error too, the given answer worked for me.

[dancazarin]

Fixed