perf script: Fix named threads support

Commit 73994dc broke named thread support in perf-script. The thread
struct in al is the main thread for a multithreaded process. The thread
struct used for analysis (e.g., dumping events) should be the specific
thread for the sample.

Signed-off-by: David Ahern <dsahern@gmail.com>
Cc: Feng Tang <feng.tang@intel.com>
Link: http://lkml.kernel.org/r/1374185175-28272-1-git-send-email-dsahern@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
index ecb6979..1cad370 100644
--- a/tools/perf/builtin-script.c
+++ b/tools/perf/builtin-script.c
@@ -397,10 +397,10 @@
 
 static void process_event(union perf_event *event, struct perf_sample *sample,
 			  struct perf_evsel *evsel, struct machine *machine,
-			  struct addr_location *al)
+			  struct thread *thread,
+			  struct addr_location *al __maybe_unused)
 {
 	struct perf_event_attr *attr = &evsel->attr;
-	struct thread *thread = al->thread;
 
 	if (output[attr->type].fields == 0)
 		return;
@@ -511,7 +511,7 @@
 	if (cpu_list && !test_bit(sample->cpu, cpu_bitmap))
 		return 0;
 
-	scripting_ops->process_event(event, sample, evsel, machine, &al);
+	scripting_ops->process_event(event, sample, evsel, machine, thread, &al);
 
 	evsel->hists.stats.total_period += sample->period;
 	return 0;