avformat/mxfdec: Avoid some redundant writing to tables in mxf_compute_ptses_fake_index()

offsets suggested by Tomas Härdin
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavformat/mxfdec.c

@@ -1940,10 +1940,10 @@ static int mxf_compute_ptses_fake_index(MXFContext *mxf, MXFIndexTable *index_ta
     if (index_table->nb_ptses <= 0)
         return 0;
 
-    if (!(index_table->ptses      = av_calloc(index_table->nb_ptses, sizeof(int64_t))) ||
+    if (!(index_table->ptses      = av_malloc_array(index_table->nb_ptses, sizeof(int64_t))) ||
         !(index_table->fake_index = av_calloc(index_table->nb_ptses, sizeof(AVIndexEntry))) ||
-        !(index_table->offsets    = av_calloc(index_table->nb_ptses, sizeof(int8_t))) ||
+        !(index_table->offsets    = av_malloc_array(index_table->nb_ptses, sizeof(int8_t))) ||
-        !(flags                   = av_calloc(index_table->nb_ptses, sizeof(uint8_t)))) {
+        !(flags                   = av_malloc_array(index_table->nb_ptses, sizeof(uint8_t)))) {
         av_freep(&index_table->ptses);
         av_freep(&index_table->fake_index);
         av_freep(&index_table->offsets);