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Remove an unreachable block in silk/float/pitch_analysis_core_FLP.c
(Fs_kHz is always 8/12/16 in Opus and also enforced by the assert on line 112)

--- a/silk/float/pitch_analysis_core_FLP.c

+++ b/silk/float/pitch_analysis_core_FLP.c

@@ -405,10 +405,8 @@

         silk_assert( lag == silk_SAT16( lag ) );

         if( Fs_kHz == 12 ) {

             lag = silk_RSHIFT_ROUND( silk_SMULBB( lag, 3 ), 1 );

-        } else if( Fs_kHz == 16 ) {

+        } else { /* Fs_kHz == 16 */

             lag = silk_LSHIFT( lag, 1 );

-        } else {

-            lag = silk_SMULBB( lag, 3 );

         }

         lag = silk_LIMIT_int( lag, min_lag, max_lag );