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Silence GCC 11+ -Wmaybe-uninitialized warnings

Reviewed by Timothy B. Terriberry.

--- a/silk/float/wrappers_FLP.c

+++ b/silk/float/wrappers_FLP.c

@@ -190,12 +190,14 @@

     opus_int32 XX_Q17[ MAX_NB_SUBFR * LTP_ORDER * LTP_ORDER ];

     opus_int32 xX_Q17[ MAX_NB_SUBFR * LTP_ORDER ];

-    for( i = 0; i < nb_subfr * LTP_ORDER * LTP_ORDER; i++ ) {

+    i = 0;

+    do {

         XX_Q17[ i ] = (opus_int32)silk_float2int( XX[ i ] * 131072.0f );

-    }

-    for( i = 0; i < nb_subfr * LTP_ORDER; i++ ) {

+    } while ( ++i < nb_subfr * LTP_ORDER * LTP_ORDER );

+    i = 0;

+    do {

         xX_Q17[ i ] = (opus_int32)silk_float2int( xX[ i ] * 131072.0f );

-    }

+    } while ( ++i < nb_subfr * LTP_ORDER );

     silk_quant_LTP_gains( B_Q14, cbk_index, periodicity_index, sum_log_gain_Q7, &pred_gain_dB_Q7, XX_Q17, xX_Q17, subfr_len, nb_subfr, arch );