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Avoid overflowing on ridiculously large energy

--- a/celt/bands.c

+++ b/celt/bands.c

@@ -224,7 +224,7 @@

 #endif

       j=M*eBands[i];

       band_end = M*eBands[i+1];

-      lg = ADD16(bandLogE[i], SHL16((opus_val16)eMeans[i],6));

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

 #ifndef FIXED_POINT

       g = celt_exp2(lg);

 #else