Opus: Ensure that NLSF cannot be negative when computing a min distance between them

third_party/opus/src/silk/NLSF_stabilize.c

Index: third_party/opus/src/silk/NLSF_stabilize.c
diff --git a/third_party/opus/src/silk/NLSF_stabilize.c b/third_party/opus/src/silk/NLSF_stabilize.c
index 1fa1ea379bdd8a4979e6f19dd74ab9af69942cec..8f3426b91e6831beb7e282a8655434e121b7069a 100644
--- a/third_party/opus/src/silk/NLSF_stabilize.c
+++ b/third_party/opus/src/silk/NLSF_stabilize.c
@@ -130,7 +130,7 @@ void silk_NLSF_stabilize(
 
         /* Keep delta_min distance between the NLSFs */
         for( i = 1; i < L; i++ )
-            NLSF_Q15[i] = silk_max_int( NLSF_Q15[i], NLSF_Q15[i-1] + NDeltaMin_Q15[i] );
+            NLSF_Q15[i] = silk_max_int( NLSF_Q15[i], silk_ADD_SAT16( NLSF_Q15[i-1], NDeltaMin_Q15[i] ) );
 
         /* Last NLSF should be no higher than 1 - NDeltaMin[L] */
         NLSF_Q15[L-1] = silk_min_int( NLSF_Q15[L-1], (1<<15) - NDeltaMin_Q15[L] );