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Fixes cap on gain in denormalise_bands()

--- a/celt/bands.c

+++ b/celt/bands.c

@@ -241,10 +241,10 @@

       /* Handle extreme gains with negative shift. */

       if (shift<0)

       {

-         /* For shift < -2 we'd be likely to overflow, so we're capping

-               the gain here. This shouldn't happen unless the bitstream is

-               already corrupted. */

-         if (shift < -2)

+         /* For shift <= -2 and g > 16384 we'd be likely to overflow, so we're

+            capping the gain here, which is equivalent to a cap of 18 on lg.

+            This shouldn't trigger unless the bitstream is already corrupted. */

+         if (shift <= -2)

          {

             g = 16384;

             shift = -2;