[PATCH 1/3] perf ftrace: Remove needless code setting default tracer

[Taeung Song]

Lately commit a349764 made 'function_graph' be the default tracer.
So ftrace.tracer variable can't be NULL but the other code setting default
tracer remained. For this reason, remove it as below.
And use existing DEFAULT_TRACER instead of "function_graph".

Cc: Jiri Olsa <jo...@kernel.org>
Cc: Namhyung Kim <namhy...@kernel.org>
Signed-off-by: Taeung Song <treeze.tae...@gmail.com>
---
 tools/perf/builtin-ftrace.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c
index d05658d..414444d 100644
--- a/tools/perf/builtin-ftrace.c
+++ b/tools/perf/builtin-ftrace.c
@@ -202,7 +202,7 @@ int cmd_ftrace(int argc, const char **argv, const char 
*prefix __maybe_unused)
 {
        int ret;
        struct perf_ftrace ftrace = {
-               .tracer = "function_graph",
+               .tracer = DEFAULT_TRACER,
                .target = { .uid = UINT_MAX, },
        };
        const char * const ftrace_usage[] = {
@@ -231,9 +231,6 @@ int cmd_ftrace(int argc, const char **argv, const char 
*prefix __maybe_unused)
        if (ret < 0)
                goto out_delete_evlist;
 
-       if (ftrace.tracer == NULL)
-               ftrace.tracer = DEFAULT_TRACER;
-
        ret = __cmd_ftrace(&ftrace, argc, argv);
 
 out_delete_evlist:
-- 
2.7.4