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Fix a comment in frame count byte decoding.

A comment in opus_decode() said, "bit 6 is ignored" when in
fact bit 6 is the padding flag, parsed in the previous block.

The comment, and the previous one, are modified to reflect
the current code.

--- a/src/opus_decoder.c

+++ b/src/opus_decoder.c

@@ -465,7 +465,7 @@

 		if (count <= 0 || st->frame_size*count*25 > 3*st->Fs)

 		    return OPUS_CORRUPTED_DATA;

 		len--;

-		/* Padding bit */

+		/* Padding flag is bit 6 */

 		if (ch&0x40)

 		{

 			int padding=0;

@@ -481,7 +481,7 @@

 		}

 		if (len<0)

 			return OPUS_CORRUPTED_DATA;

-		/* Bit 7 is VBR flag (bit 6 is ignored) */

+		/* VBR flag is bit 7 */

 		if (ch&0x80)

 		{

 			/* VBR case */