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Making it clearer to Coverity that nStates cannot exceed NLSF_QUANT_DEL_DEC_STATES

--- a/silk/NLSF_del_dec_quant.c

+++ b/silk/NLSF_del_dec_quant.c

@@ -131,7 +131,7 @@

             RD_Q25[ j + nStates ] = silk_SMLABB( silk_MLA( RD_tmp_Q25, silk_SMULBB( diff_Q10, diff_Q10 ), w_Q5[ i ] ), mu_Q20, rate1_Q5 );

         }

-        if( nStates < NLSF_QUANT_DEL_DEC_STATES ) {

+        if( silk_LSHIFT( nStates, 1 ) <= NLSF_QUANT_DEL_DEC_STATES ) {

             /* double number of states and copy */

             for( j = 0; j < nStates; j++ ) {

                 ind[ j + nStates ][ i ] = ind[ j ][ i ] + 1;