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Add FIXED_POINT check if using celt_fir in SILK's LPC analysis filter

Use of celt_fir remains off by default

--- a/silk/LPC_analysis_filter.c

+++ b/silk/LPC_analysis_filter.c

@@ -56,7 +56,7 @@

 )

 {

     opus_int   j;

-#if USE_CELT_FIR

+#if defined(FIXED_POINT) && USE_CELT_FIR

     opus_int16 num[SILK_MAX_ORDER_LPC];

 #else

     int ix;

@@ -68,7 +68,7 @@

     silk_assert( (d & 1) == 0 );

     silk_assert( d <= len );

-#if USE_CELT_FIR

+#if defined(FIXED_POINT) && USE_CELT_FIR

     silk_assert( d <= SILK_MAX_ORDER_LPC );

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

         num[ j ] = -B[ j ];