10l fix mxf_get_essence_container_ul

Originally committed as revision 15098 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/mxfenc.c

@@ -204,11 +204,10 @@ static int klv_encode_ber_length(ByteIOContext *pb, uint64_t len)
  */
 static const UID *mxf_get_essence_container_ul(enum CodecID type, int *index)
 {
-    const MXFContainerEssencePair *uls = mxf_essence_container_uls;
     for (*index = 0; *index < sizeof(mxf_essence_container_uls)/
                               sizeof(*mxf_essence_container_uls); (*index)++)
         if (mxf_essence_container_uls[*index].id == type)
-            return &uls->container_ul;
+            return &mxf_essence_container_uls[*index].container_ul;
     *index = -1;
     return NULL;
 }