[Opus] Update to v1.2.1

third_party/opus/src/silk/mips/NSQ_del_dec_mipsr1.h

Index: third_party/opus/src/silk/mips/NSQ_del_dec_mipsr1.h
diff --git a/third_party/opus/src/silk/mips/NSQ_del_dec_mipsr1.h b/third_party/opus/src/silk/mips/NSQ_del_dec_mipsr1.h
index ad1cfe2a9b0841012701b1fe77d7da2f044d0b26..cd70713a8f5d9453ec62d7786bc30a90abddc409 100644
--- a/third_party/opus/src/silk/mips/NSQ_del_dec_mipsr1.h
+++ b/third_party/opus/src/silk/mips/NSQ_del_dec_mipsr1.h
@@ -61,7 +61,7 @@ static inline void silk_noise_shape_quantizer_del_dec(
     opus_int            predictLPCOrder,        /* I    Prediction filter order             */
     opus_int            warping_Q16,            /* I                                        */
     opus_int            nStatesDelayedDecision, /* I    Number of states in decision tree   */
-    opus_int            *smpl_buf_idx,          /* I    Index to newest samples in buffers  */
+    opus_int            *smpl_buf_idx,          /* I/O  Index to newest samples in buffers  */
     opus_int            decisionDelay,          /* I                                        */
     int                 arch                    /* I                                        */
 )
@@ -323,8 +323,9 @@ static inline void silk_noise_shape_quantizer_del_dec(
             psSS[ 1 ].xq_Q14       = xq_Q14;
         }
 
-        *smpl_buf_idx  = ( *smpl_buf_idx - 1 ) & DECISION_DELAY_MASK;                   /* Index to newest samples              */
-        last_smple_idx = ( *smpl_buf_idx + decisionDelay ) & DECISION_DELAY_MASK;       /* Index to decisionDelay old samples   */
+        *smpl_buf_idx  = ( *smpl_buf_idx - 1 ) % DECISION_DELAY;
+        if( *smpl_buf_idx < 0 ) *smpl_buf_idx += DECISION_DELAY;
+        last_smple_idx = ( *smpl_buf_idx + decisionDelay ) % DECISION_DELAY;
 
         /* Find winner */
         RDmin_Q10 = psSampleState[ 0 ][ 0 ].RD_Q10;