libhevcdec: iquant-itrans issue in chroma planes

Misplaced local array on stack is resulting in color artifacts in
decoded yuv. It worked so far, because the array luma_nbr_flags_4x4[]
was always allocated on the same address and thus preserved values from
previous iteration.

Bug: 148157334
Test: atest android.media.cts.HeifWriterTest
Change-Id: Ic2b1964895bf26101508ff2ac82a94192b7b74f8
diff --git a/decoder/ihevcd_iquant_itrans_recon_ctb.c b/decoder/ihevcd_iquant_itrans_recon_ctb.c
index a7cd167..8425506 100644
--- a/decoder/ihevcd_iquant_itrans_recon_ctb.c
+++ b/decoder/ihevcd_iquant_itrans_recon_ctb.c
@@ -542,6 +542,7 @@
     WORD16 *pi2_tmp;
     WORD32 pic_strd;
     WORD32 luma_nbr_flags;
+    WORD32 luma_nbr_flags_4x4[4] = { 0 };
     WORD32 chroma_nbr_flags = 0;
     UWORD8 u1_luma_pred_mode_first_tu = 0;
     /* Pointers for generating 2d coeffs from coeff-map */
@@ -678,7 +679,6 @@
         WORD32 tu_y_offset, tu_uv_offset;
         WORD8 i1_chroma_pic_qp_offset, i1_chroma_slice_qp_offset;
         UWORD8 u1_cbf = 0, u1_cbf_v = 0, u1_luma_pred_mode, u1_chroma_pred_mode;
-        WORD32 luma_nbr_flags_4x4[4];
         WORD32 offset;
         WORD32 pcm_flag;
         WORD32  chroma_yuv420sp_vu = (ps_codec->e_ref_chroma_fmt == IV_YUV_420SP_VU);