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matroska: use temp variable for block timecode

--- a/matroska.c

+++ b/matroska.c

@@ -190,6 +190,7 @@

 	int isebml, npackets, i, skipdata, lacing;

 	uvlong ts, timestamp, timestampscale;

 	double duration;

+	s16int timecode;

 	uchar *buf, *b;

 	Ebml e, te;

 	Elspec el;

@@ -304,6 +305,7 @@

 				}

 				left -= sz;

 				sz -= 3;

+				timecode = buf[0]<<8 | buf[1];

 				lacing = (buf[2] >> 1) & 3;

 				npackets = buf[3]+1;

@@ -403,7 +405,7 @@

 				}

 				/* ns timestamp */

-				ts = (timestamp + (s16int)(buf[0]<<8 | buf[1])) * timestampscale - te.codec.delay;

+				ts = (timestamp + timecode) * timestampscale - te.codec.delay;

 				if(te.fpacket(&out, &te, packets, npackets, ts) != 0)

 					goto err;

 				continue;