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Prevents the SILK encoder from failing below 600 kb/s stereo.

Not that it actually reaches the target, but it should no longer cause
a range coder mismatch

--- a/silk/silk_stereo_LR_to_MS.c

+++ b/silk/silk_stereo_LR_to_MS.c

@@ -96,6 +96,8 @@

     /* Determine bitrate distribution between mid and side, and possibly reduce stereo width */

     total_rate_bps -= is10msFrame ? 1200 : 600;      /* Subtract approximate bitrate for coding stereo parameters */

+    if (total_rate_bps < 1)

+        total_rate_bps = 1;

     min_mid_rate_bps = SKP_SMLABB( 2000, fs_kHz, 900 );

     SKP_assert( min_mid_rate_bps < 32767 );

     /* Default bitrate distribution: 8 parts for Mid and (5+3*frac) parts for Side. so: mid_rate = ( 8 / ( 13 + 3 * frac ) ) * total_ rate */