perf kmem: Respect -i option

Currently the perf kmem does not respect -i option.

Initializing the file.path properly after options get parsed.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Joonsoo Kim <js1304@gmail.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: linux-mm@kvack.org
Link: http://lkml.kernel.org/r/1428298576-9785-2-git-send-email-namhyung@kernel.org
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-kmem.c

@@ -663,7 +663,6 @@ int cmd_kmem(int argc, const char **argv, const char *prefix __maybe_unused)
 {
 	const char * const default_sort_order = "frag,hit,bytes";
 	struct perf_data_file file = {
-		.path = input_name,
 		.mode = PERF_DATA_MODE_READ,
 	};
 	const struct option kmem_options[] = {
@@ -701,6 +700,8 @@ int cmd_kmem(int argc, const char **argv, const char *prefix __maybe_unused)
 		return __cmd_record(argc, argv);
 	}
 
+	file.path = input_name;
+
 	session = perf_session__new(&file, false, &perf_kmem);
 	if (session == NULL)
 		return -1;