perf trace: Fix leaks of 'struct thread' in fprintf_sys_enter()

I've found some leaks from 'perf trace -a'.

It seems there are more leaks but this is what I can find for now.

Fixes: 7035102 ("perf thread: Add support for reading the e_machine type for a thread")
Reviewed-by: Howard Chu <howardchu95@gmail.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20250403054213.7021-1-namhyung@kernel.org
[ split from a larget patch ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

Author: namhyung

tools/perf/builtin-trace.c

@@ -2842,7 +2842,7 @@ static int trace__fprintf_sys_enter(struct trace *trace, struct evsel *evsel,
 	e_machine = thread__e_machine(thread, trace->host);
 	sc = trace__syscall_info(trace, evsel, e_machine, id);
 	if (sc == NULL)
-		return -1;
+		goto out_put;
 	ttrace = thread__trace(thread, trace);
 	/*
 	 * We need to get ttrace just to make sure it is there when syscall__scnprintf_args()