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Prevents a SILK stereo encoding-side desync

We now make sure that side is given >0 bits when it isn't disabled.

--- a/silk/stereo_LR_to_MS.c

+++ b/silk/stereo_LR_to_MS.c

@@ -168,6 +168,11 @@

         width_Q14 = state->smth_width_Q14;

     }

+    if (*mid_only_flag == 0 && mid_side_rates_bps[ 1 ] < 1)

+    {

+        mid_side_rates_bps[ 1 ] = 1;

+        mid_side_rates_bps[ 0 ] = silk_max_int( 1, total_rate_bps - mid_side_rates_bps[ 1 ]);

+    }

 #if 0

     DEBUG_STORE_DATA( midside.dat, &mid_side_rates_bps[ 0 ], 8 );

     DEBUG_STORE_DATA( norms0.pcm, &state->mid_side_amp_Q0[0], 8 );