[Opus] Update to v1.2.1

third_party/opus/src/silk/fixed/schur_FIX.c

Index: third_party/opus/src/silk/fixed/schur_FIX.c
diff --git a/third_party/opus/src/silk/fixed/schur_FIX.c b/third_party/opus/src/silk/fixed/schur_FIX.c
index c4c0ef23b47804e5f56c7c5d58c66556eef5a01e..59d44a6f7fe858c21eebca31b6be4430acd48319 100644
--- a/third_party/opus/src/silk/fixed/schur_FIX.c
+++ b/third_party/opus/src/silk/fixed/schur_FIX.c
@@ -43,28 +43,29 @@ opus_int32 silk_schur(                              /* O    Returns residual ene
     opus_int32    C[ SILK_MAX_ORDER_LPC + 1 ][ 2 ];
     opus_int32    Ctmp1, Ctmp2, rc_tmp_Q15;
 
-    silk_assert( order==6||order==8||order==10||order==12||order==14||order==16 );
+    silk_assert( order >= 0 && order <= SILK_MAX_ORDER_LPC );
 
     /* Get number of leading zeros */
     lz = silk_CLZ32( c[ 0 ] );
 
     /* Copy correlations and adjust level to Q30 */
+    k = 0;
     if( lz < 2 ) {
         /* lz must be 1, so shift one to the right */
-        for( k = 0; k < order + 1; k++ ) {
+        do {
             C[ k ][ 0 ] = C[ k ][ 1 ] = silk_RSHIFT( c[ k ], 1 );
-        }
+        } while( ++k <= order );
     } else if( lz > 2 ) {
         /* Shift to the left */
         lz -= 2;
-        for( k = 0; k < order + 1; k++ ) {
+        do {
             C[ k ][ 0 ] = C[ k ][ 1 ] = silk_LSHIFT( c[ k ], lz );
-        }
+        } while( ++k <= order );
     } else {
         /* No need to shift */
-        for( k = 0; k < order + 1; k++ ) {
+        do {
             C[ k ][ 0 ] = C[ k ][ 1 ] = c[ k ];
-        }
+        } while( ++k <= order );
     }
 
     for( k = 0; k < order; k++ ) {