Fix bad syntax in test_infra integration test.

test/integration/targets/test_infra/runme.sh

@@ -7,7 +7,7 @@ PB_OUT=$(ansible-playbook -i inventory.local test_test_infra.yml)
 APB_RC=$?
 echo "$PB_OUT"
 echo "rc was $APB_RC (must be non-zero)"
-[ $$APB_RC -ne 0 ]
+[ ${APB_RC} -ne 0 ]
 echo "ensure playbook output shows assert/fail works (True)"
 echo "$PB_OUT" | grep -F "fail works (True)" || exit 1
 echo "$PB_OUT" | grep -F "assert works (True)" || exit 1
@@ -17,7 +17,7 @@ PB_OUT=$(ansible-playbook -i ../../inventory test_test_infra.yml "$@")
 APB_RC=$?
 echo "$PB_OUT"
 echo "rc was $APB_RC (must be non-zero)"
-[ $$APB_RC -ne 0 ]
+[ ${APB_RC} -ne 0 ]
 echo "ensure playbook output shows assert/fail works (True)"
 echo "$PB_OUT" | grep -F "fail works (True)" || exit 1
 echo "$PB_OUT" | grep -F "assert works (True)" || exit 1