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opusenc: Write valid Opus file when 80+ channels

--- a/src/opusenc.c

+++ b/src/opusenc.c

@@ -847,8 +847,12 @@

   /*Write header*/

   {

-    unsigned char header_data[100];

-    int packet_size=opus_header_to_packet(&header, header_data, 100);

+    /*The Identification Header is 19 bytes, plus a Channel Mapping Table for

+      mapping families other than 0. The Channel Mapping Table is 2 bytes +

+      1 byte per channel. Because the maximum number of channels is 255, the

+      maximum size of this header is 19 + 2 + 255 = 276 bytes.*/

+    unsigned char header_data[276];

+    int packet_size=opus_header_to_packet(&header, header_data, sizeof(header_data));

     op.packet=header_data;

     op.bytes=packet_size;

     op.b_o_s=1;