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Prevent dividing by 0 when target-bitrate is 0.

Change-Id: I05b7fb378b6b0c5f263e7839f96ba6830ee34fd2

--- a/rate_hist.c

+++ b/rate_hist.c

@@ -88,6 +88,9 @@

   if (now < cfg->rc_buf_initial_sz)

     return;

+  if (!cfg->rc_target_bitrate)

+    return;

+

   then = now;

   /* Sum the size over the past rc_buf_sz ms */