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Increase headroom to avoid overflow in silk_pitch_analysis_core()

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

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

@@ -141,7 +141,7 @@

     /* Downscale input if necessary */

     silk_sum_sqr_shift( &energy, &shift, frame_unscaled, frame_length );

-    shift += 2 - silk_CLZ32( energy );        /* at least one bit headroom */

+    shift += 3 - silk_CLZ32( energy );        /* at least two bits headroom */

     ALLOC( frame_scaled, frame_length, opus_int16 );

     if( shift > 0 ) {

         shift = silk_RSHIFT( shift + 1, 1 );