[Discuss-gnuradio] QT GUI Frequency Sink and real inputs labels are wrong for FFT length != 1024

[Marcus D. Leech]

If one selects real input on a QT GUI Frequency sink, and also selects 
half-width, and also has an FFT size != 1024, then the X-axis labels are 
wrong.

If using an FFT length of 1024, the X axis labels proceed from 0 to 
bandwidth/2, as one might expect.  I tried playing with the "center 
frequency"
 parameter to make the labels make sense, but I couldn't find a setting 
that made it better...

v3.7.6.1-89-gc990e825