Ensure that NLSF cannot be negative when computing a min distance between them b/31607432 Signed-off-by: Jean-Marc Valin <jmvalin@jmvalin.ca> (cherry picked from commit d9d5ac4027c5ee1da2ff1c6572ae3b35a845db19) Change-Id: I506598e403ab03118da6f6cc1331d84e0de2e655

diff --git a/silk/NLSF_stabilize.c b/silk/NLSF_stabilize.c
index 1fa1ea3..8f3426b 100644
--- a/silk/NLSF_stabilize.c
+++ b/silk/NLSF_stabilize.c

@@ -130,7 +130,7 @@
 
         /* 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] );