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

void ih264d_deblock_picture(void *ptr)
{
 dec_struct_t *ps_dec = (dec_struct_t *)ptr;

 {
 /*Deblock picture only if all the mb's in the frame have been decoded*/
 if(ps_dec->u1_pic_decode_done == 1)
 {
 if(ps_dec->ps_cur_slice->u1_mbaff_frame_flag
 || ps_dec->ps_cur_slice->u1_field_pic_flag)
 {
                ps_dec->p_DeblockPicture[ps_dec->ps_cur_slice->u1_mbaff_frame_flag](
                                ps_dec);
 }
 else

 {

                ih264d_deblock_picture_progressive(ps_dec);
 }

 }
 }

}

void ih264d_deblock_picture(void *ptr)
{
 dec_struct_t *ps_dec = (dec_struct_t *)ptr;

 {
 /*Deblock picture only if all the mb's in the frame have been decoded*/
 if(ps_dec->u1_pic_decode_done == 1)
 {
 if(ps_dec->ps_cur_slice->u1_mbaff_frame_flag
 || ps_dec->ps_cur_slice->u1_field_pic_flag)
 {
                ps_dec->p_DeblockPicture[ps_dec->ps_cur_slice->u1_mbaff_frame_flag](
                                ps_dec);
 }
 else

 {

                ih264d_deblock_picture_progressive(ps_dec);
 }

 }
 }

}
