Decoder: Initialize first_pb_nal_in_pic for error slices

first_pb_nal_in_pic was uninitialized for error clips

Bug: 29023649

Change-Id: Ie4e0a94059c5f675bf619e31534846e2c2ca58ae
(cherry picked from commit 7a54468cf8b56745d371baf83694c87a563907fc)
diff --git a/decoder/ih264d_api.c b/decoder/ih264d_api.c
index 1a9e32e..6aa71f2 100644
--- a/decoder/ih264d_api.c
+++ b/decoder/ih264d_api.c
@@ -1895,6 +1895,7 @@
     ps_dec->cur_dec_mb_num = 0;
     ps_dec->cur_recon_mb_num = 0;
     ps_dec->u4_first_slice_in_pic = 2;
+    ps_dec->u1_first_pb_nal_in_pic = 1;
     ps_dec->u1_slice_header_done = 0;
     ps_dec->u1_dangling_field = 0;
 
diff --git a/decoder/ih264d_parse_slice.c b/decoder/ih264d_parse_slice.c
index 73bc45d..911b11d 100644
--- a/decoder/ih264d_parse_slice.c
+++ b/decoder/ih264d_parse_slice.c
@@ -940,7 +940,6 @@
     dec_slice_params_t *ps_cur_slice = ps_dec->ps_cur_slice;
     WORD32 ret;
 
-    ps_dec->u1_first_pb_nal_in_pic = 1;
     ps_dec->u2_mbx = 0xffff;
     ps_dec->u2_mby = 0;
     {