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

Signed-off-by: Jean-Marc Valin <jmvalin@jmvalin.ca>

--- 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] );