perf util: Fix potential SEGFAULT in put_tracepoints_path error path

This patch fix potential segment fault triggered in
put_tracepoints_path() when the address of the local variable 'path' be
freed in error path of record_saved_cmdline.
Signed-off-by: Li Bin <huawei.libin@huawei.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Hongbo Yao <yaohongbo@huawei.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Xie XiuQi <xiexiuqi@huawei.com>
Link: http://lore.kernel.org/lkml/20200521133218.30150-5-liwei391@huawei.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/trace-event-info.c

@@ -428,7 +428,7 @@ get_tracepoints_path(struct list_head *pattrs)
 		if (!ppath->next) {
 error:
 			pr_debug("No memory to alloc tracepoints list\n");
-			put_tracepoints_path(&path);
+			put_tracepoints_path(path.next);
 			return NULL;
 		}
 next: