Merge pull request #830 from lcp/fix-data_t

hello_perf_output: match the data type of pid
diff --git a/examples/tracing/hello_perf_output.py b/examples/tracing/hello_perf_output.py
index 78f94e6..cfff264 100755
--- a/examples/tracing/hello_perf_output.py
+++ b/examples/tracing/hello_perf_output.py
@@ -37,7 +37,7 @@
 # define output data structure in Python
 TASK_COMM_LEN = 16    # linux/sched.h
 class Data(ct.Structure):
-    _fields_ = [("pid", ct.c_ulonglong),
+    _fields_ = [("pid", ct.c_uint),
                 ("ts", ct.c_ulonglong),
                 ("comm", ct.c_char * TASK_COMM_LEN)]