Fix sign/unsigned issue breaking SDK build bots

TBR=sergeyu@chromium.org

Review URL: https://chromiumcodereview.appspot.com/10836190

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@151152 0039d316-1c4b-4281-b951-d872f2087c98

ppapi/native_client/src/shared/ppapi_proxy/plugin_ppb_network_list_private.cc

@@ -139,7 +139,7 @@ int32_t GetIpAddresses(PP_Resource resource,
   DebugPrintf("PPB_NetworkList_Private::GetIpAddresses: %s\n",
               NaClSrpcErrorString(srpc_result));
 
-  DCHECK(addr_count > count ||
+  DCHECK(static_cast<uint32_t>(addr_count) > count ||
          addr_count * sizeof(PP_NetAddress_Private) == addr_size);
 
   return addr_count;