Remove redundancies of multiply() in FFTFrame.

Source/platform/audio/FFTFrame.h

Index: Source/platform/audio/FFTFrame.h
diff --git a/Source/platform/audio/FFTFrame.h b/Source/platform/audio/FFTFrame.h
index abc4e5c4f4d9fe9b51d8e82ac4dbc1f90b7c709d..5fdc97dc0562565bb50897724c9c5c42f900542e 100644
--- a/Source/platform/audio/FFTFrame.h
+++ b/Source/platform/audio/FFTFrame.h
@@ -66,7 +66,6 @@ public:
     static void cleanup();
     void doFFT(const float* data);
     void doInverseFFT(float* data);
-    void multiply(const FFTFrame& frame); // multiplies ourself with frame : effectively operator*=()
 
     float* realData() const;
     float* imagData() const;
@@ -82,6 +81,7 @@ public:
     void doPaddedFFT(const float* data, size_t dataSize); // zero-padding with dataSize <= fftSize
     double extractAverageGroupDelay();
     void addConstantGroupDelay(double sampleFrameDelay);
+    void multiply(const FFTFrame&); // multiplies ourself with frame : effectively operator*=()
 
     unsigned fftSize() const { return m_FFTSize; }
     unsigned log2FFTSize() const { return m_log2FFTSize; }