Fix expression.

Author: ysiraichi

infra/ansible/playbook.yaml

@@ -92,7 +92,7 @@
         env_vars: "{{
             build_env.common | default({}, true) |
             combine(build_env[arch] | default({}, true)) |
-            combine(build_env[accelerator] | default({}, true))
+            combine(build_env[accelerator] | default({}, true)) |
             combine(clang_compiler)
           }}"
       when: stage == "build_plugin"