demux: mp4: fix memleak on error

(cherry picked from commit 849b1b27c224a8223a4aa0094db1c6d321733c86)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

modules/demux/mp4/mp4.c

@@ -1946,6 +1946,8 @@ static int TrackCreateSamplesIndex( demux_t *p_demux,
             ck->p_sample_delta_dts = calloc( i_entry, sizeof( uint32_t ) );
             if( !ck->p_sample_count_dts || !ck->p_sample_delta_dts )
             {
+                free( ck->p_sample_count_dts );
+                free( ck->p_sample_delta_dts );
                 msg_Err( p_demux, "can't allocate memory for i_entry=%"PRIu32, i_entry );
                 return VLC_ENOMEM;
             }
@@ -2043,6 +2045,8 @@ static int TrackCreateSamplesIndex( demux_t *p_demux,
             ck->p_sample_offset_pts = calloc( i_entry, sizeof( int32_t ) );
             if( !ck->p_sample_count_pts || !ck->p_sample_offset_pts )
             {
+                free( ck->p_sample_count_pts );
+                free( ck->p_sample_offset_pts );
                 msg_Err( p_demux, "can't allocate memory for i_entry=%"PRIu32, i_entry );
                 return VLC_ENOMEM;
             }