avformat/hlsproto: Use av_freep, to avoid leaving stale pointers in memory

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/hlsproto.c

@@ -80,7 +80,7 @@ static void free_segment_list(HLSContext *s)
 {
     int i;
     for (i = 0; i < s->n_segments; i++)
-        av_free(s->segments[i]);
+        av_freep(&s->segments[i]);
     av_freep(&s->segments);
     s->n_segments = 0;
 }
@@ -89,7 +89,7 @@ static void free_variant_list(HLSContext *s)
 {
     int i;
     for (i = 0; i < s->n_variants; i++)
-        av_free(s->variants[i]);
+        av_freep(&s->variants[i]);
     av_freep(&s->variants);
     s->n_variants = 0;
 }