Decoder: Set u1_long_term_reference_flag to 0 for error concealment

For MBs which are in error, set u1_long_term_reference_flag to zero.
This ensures latest frame is used for concealment

Bug: 28470138
Change-Id: I58eab5bc1da277823f3dbb4103ba50867f8935dc
diff --git a/decoder/ih264d_parse_pslice.c b/decoder/ih264d_parse_pslice.c
index 9f56a0e..1127838 100644
--- a/decoder/ih264d_parse_pslice.c
+++ b/decoder/ih264d_parse_pslice.c
@@ -1462,7 +1462,7 @@
         ih264d_err_pic_dispbuf_mgr(ps_dec);
         return 0;
     }
-
+    ps_dec->ps_dpb_cmds->u1_long_term_reference_flag = 0;
     if(prev_slice_err == 1)
     {
         /* first slice - missing/header corruption */