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Fixes a minor bug found by valgrind in the bandwidth detector

The energy calculation from the packed FFTs ended up reading out-of-bound
memory for frequency zero. The bug was exposed by c5e04e4.

--- a/src/analysis.c

+++ b/src/analysis.c

@@ -101,7 +101,7 @@

 };

 static const int extra_bands[NB_TOT_BANDS+1] = {

-      0, 2,  4,  6,  8, 10, 12, 14, 16, 20, 24, 28, 32, 40, 48, 56, 68, 80, 96, 120, 160, 200

+      1, 2,  4,  6,  8, 10, 12, 14, 16, 20, 24, 28, 32, 40, 48, 56, 68, 80, 96, 120, 160, 200

 };

 /*static const float tweight[NB_TBANDS+1] = {