avformat/matroskaenc: functions that add entries should not destroy the whole list on failure

This reverts a hunk from "avformat: Use av_reallocp_array() where suitable"
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/matroskaenc.c

@@ -302,17 +302,14 @@ static mkv_seekhead * mkv_start_seekhead(AVIOContext *pb, int64_t segment_offset
 static int mkv_add_seekhead_entry(mkv_seekhead *seekhead, unsigned int elementid, uint64_t filepos)
 {
     mkv_seekhead_entry *entries = seekhead->entries;
-    int err;
 
     // don't store more elements than we reserved space for
     if (seekhead->max_entries > 0 && seekhead->max_entries <= seekhead->num_entries)
         return -1;
 
-    if ((err = av_reallocp_array(&entries, seekhead->num_entries + 1,
-                                 sizeof(*entries))) < 0) {
-        seekhead->num_entries = 0;
-        return err;
-    }
+    entries = av_realloc(entries, (seekhead->num_entries + 1) * sizeof(mkv_seekhead_entry));
+    if (entries == NULL)
+        return AVERROR(ENOMEM);
 
     entries[seekhead->num_entries  ].elementid = elementid;
     entries[seekhead->num_entries++].segmentpos = filepos - seekhead->segment_offset;
@@ -387,16 +384,13 @@ static mkv_cues * mkv_start_cues(int64_t segment_offset)
 static int mkv_add_cuepoint(mkv_cues *cues, int stream, int64_t ts, int64_t cluster_pos, int64_t relative_pos)
 {
     mkv_cuepoint *entries = cues->entries;
-    int err;
 
     if (ts < 0)
         return 0;
 
-    if ((err = av_reallocp_array(&entries, cues->num_entries + 1,
-                                 sizeof(*entries))) < 0) {
-        cues->num_entries = 0;
-        return err;
-    }
+    entries = av_realloc(entries, (cues->num_entries + 1) * sizeof(mkv_cuepoint));
+    if (entries == NULL)
+        return AVERROR(ENOMEM);
 
     entries[cues->num_entries  ].pts = ts;
     entries[cues->num_entries  ].tracknum = stream + 1;