automated: lib: parse_rt_tests_results: pi-stress: fix output

Signed-off-by: Anders Roxell <anders.roxell@linaro.org>
diff --git a/automated/lib/parse_rt_tests_results.py b/automated/lib/parse_rt_tests_results.py
index 9cc0f1e..5c966c5 100755
--- a/automated/lib/parse_rt_tests_results.py
+++ b/automated/lib/parse_rt_tests_results.py
@@ -69,9 +69,9 @@
         # rlta timertat also knows about irqs
         parse_irqs(rawdata)
 
-    elif "inversions" in rawdata:
+    elif "inversion" in rawdata:
         # pi_stress
-        print("inversion {}\n".format(rawdata("inversions")))
+        print("inversion pass {} count\n".format(rawdata["inversion"]))
 
     if int(rawdata["return_code"]) == 0:
         print("{} pass".format(testname))