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[spatial svc]Fix signed/unsigned mismatch error

Change-Id: I5e3b8b1b151bc14416577f85434182cba2302679

--- a/vp9/vp9_cx_iface.c

+++ b/vp9/vp9_cx_iface.c

@@ -178,7 +178,7 @@

 #ifdef CONFIG_SPATIAL_SVC

   if (cfg->ss_number_layers > 1) {

-    int i, alt_ref_sum = 0;

+    unsigned int i, alt_ref_sum = 0;

     for (i = 0; i < cfg->ss_number_layers; ++i) {

       if (cfg->ss_enable_auto_alt_ref[i])

         ++alt_ref_sum;