perf scripting python: Assign perf_script_context

The scripting_context pointer itself does not change and nor does it need
to. Put it directly into the script as a variable at the start so it does
not have to be passed on each call into the script.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: https://lore.kernel.org/r/20210530192308.7382-6-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/scripts/python/Perf-Trace-Util/Context.c

@@ -91,6 +91,12 @@ PyMODINIT_FUNC PyInit_perf_trace_context(void)
 		NULL,			/* m_clear */
 		NULL,			/* m_free */
 	};
-	return PyModule_Create(&moduledef);
+	PyObject *mod;
+
+	mod = PyModule_Create(&moduledef);
+	/* Add perf_script_context to the module so it can be imported */
+	PyObject_SetAttrString(mod, "perf_script_context", Py_None);
+
+	return mod;
 }
 #endif