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Fix for possible null pointer dereferencing, closes Coverity report 68 run 2.

Originally committed as revision 14305 to svn://svn.ffmpeg.org/ffmpeg/trunk

Benjamin Larsson authored on 2008/07/20 00:48:53
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@@ -1452,6 +1452,9 @@ static void qdm2_decode_fft_packets (QDM2Context *q)
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         max = min;
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         /* check for errors (?) */
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+        if (!packet)
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+            return;
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+
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         if (i == 0 && (packet->type < 16 || packet->type >= 48 || fft_subpackets[packet->type - 16]))
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             return;
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