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Fixes a fixed-point overflow in the new pitch code

--- a/silk/fixed/pitch_analysis_core_FIX.c

+++ b/silk/fixed/pitch_analysis_core_FIX.c

@@ -485,7 +485,7 @@

             Lag_CB_ptr      = &silk_CB_lags_stage3_10_ms[ 0 ][ 0 ];

         }

-        target_ptr = &frame[ PE_LTP_MEM_LENGTH_MS * Fs_kHz ];

+        target_ptr = &input_frame_ptr[ PE_LTP_MEM_LENGTH_MS * Fs_kHz ];

         energy_target = silk_ADD32( silk_inner_prod_aligned( target_ptr, target_ptr, nb_subfr * sf_length ), 1 );

         for( d = start_lag; d <= end_lag; d++ ) {

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