perf lock: Avoid memory leaks from strdup()

Leak sanitizer complains about the strdup-ed arguments not being freed
and given cmd_record doesn't modify the given strings, remove the
strdups.

Original discussion in this patch:

  https://lore.kernel.org/lkml/[email protected]/

Suggested-by: Namhyung Kim <[email protected]>
Signed-off-by: Ian Rogers <[email protected]>
Acked-by: Namhyung Kim <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Kan Liang <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: zhaimingbing <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

Author: captain5050

tools/perf/builtin-lock.c

@@ -2275,23 +2275,13 @@ static int __cmd_record(int argc, const char **argv)
 		return -ENOMEM;
 
 	for (i = 0; i < ARRAY_SIZE(record_args); i++)
-		rec_argv[i] = strdup(record_args[i]);
+		rec_argv[i] = record_args[i];
 
 	for (j = 0; j < nr_tracepoints; j++) {
-		const char *ev_name;
-
-		if (has_lock_stat)
-			ev_name = strdup(lock_tracepoints[j].name);
-		else
-			ev_name = strdup(contention_tracepoints[j].name);
-
-		if (!ev_name) {
-			free(rec_argv);
-			return -ENOMEM;
-		}
-
 		rec_argv[i++] = "-e";
-		rec_argv[i++] = ev_name;
+		rec_argv[i++] = has_lock_stat
+			? lock_tracepoints[j].name
+			: contention_tracepoints[j].name;
 	}
 
 	for (j = 0; j < nr_callgraph_args; j++, i++)