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vp9-svc: Fix to allowed value of max_consec_drop.

For the max_consec_drop parameter in svc frame drop:
since passing value 0 in the control would completely
disable the dropper, only allow for values >= 1 to be set.

Change-Id: I6b74ec9cc08a638fa571d6246a021dab9c811d14

--- a/vp9/vp9_cx_iface.c

+++ b/vp9/vp9_cx_iface.c

@@ -1538,7 +1538,8 @@

   cpi->svc.framedrop_mode = data->framedrop_mode;

   for (sl = 0; sl < cpi->svc.number_spatial_layers; ++sl)

     cpi->svc.framedrop_thresh[sl] = data->framedrop_thresh[sl];

-  cpi->svc.max_consec_drop = data->max_consec_drop;

+  // Don't allow max_consec_drop values below 1.

+  cpi->svc.max_consec_drop = VPXMAX(1, data->max_consec_drop);

   return VPX_CODEC_OK;

 }