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Prevents ridiculously large gains from causing inf/NaNs in float decoder

--- a/celt/bands.c

+++ b/celt/bands.c

@@ -226,7 +226,7 @@

       band_end = M*eBands[i+1];

       lg = SATURATE16(ADD32(bandLogE[i], SHL32((opus_val32)eMeans[i],6)));

 #ifndef FIXED_POINT

-      g = celt_exp2(lg);

+      g = celt_exp2(MIN32(32.f, lg));

 #else

       /* Handle the integer part of the log energy */

       shift = 16-(lg>>DB_SHIFT);