Fixed another minor visual studio compiler error.

f320932e · Davis King · 5c9307ea · f320932e
Commit f320932e authored Apr 20, 2013 by Davis King
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dlib/matrix/matrix_fft.h dlib/matrix/matrix_fft.h +1 -1

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--- a/dlib/matrix/matrix_fft.h
+++ b/dlib/matrix/matrix_fft.h
@@ -44,7 +44,7 @@ namespace dlib
            if (data.size() == 0)
                return;
-            const unsigned long num = static_cast<unsigned long>(std::log(data.size())/std::log(2.0) + 0.5);
+            const unsigned long num = static_cast<unsigned long>(std::log((double)data.size())/std::log(2.0) + 0.5);
            for (unsigned long i = 0; i < (unsigned long)data.size(); ++i)
            {
                outdata(impl::reverse_bits(i,num)) = data(i);