av_log() patch by (Michel Bardiaux <mbardiaux at peaktime dot be>)

Originally committed as revision 2840 to svn://svn.ffmpeg.org/ffmpeg/trunk

output_example.c

@@ -408,7 +408,7 @@ int main(int argc, char **argv)
     }
     
     /* allocate the output media context */
-    oc = av_mallocz(sizeof(AVFormatContext));
+    oc = av_alloc_format_context();
     if (!oc) {
         fprintf(stderr, "Memory error\n");
         exit(1);