[PATCH] function_graph: remove unnecessary initialization in ftrace_graph_ret_addr()

[Oleg Nesterov]

After the commit 29c1c24a2707 ("function_graph: Fix up ftrace_graph_ret_addr()")
ftrace_graph_ret_addr() doesn't need to initialize "int i" at the start.

While at it, move the declaration of "ret_stack" into the main loop.

Signed-off-by: Oleg Nesterov <o...@redhat.com>
---
 kernel/trace/fgraph.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/kernel/trace/fgraph.c b/kernel/trace/fgraph.c
index d7d4fb403f6f..d45a8bc97997 100644
--- a/kernel/trace/fgraph.c
+++ b/kernel/trace/fgraph.c
@@ -890,9 +890,8 @@ ftrace_graph_get_ret_stack(struct task_struct *task, int 
idx)
 unsigned long ftrace_graph_ret_addr(struct task_struct *task, int *idx,
                                    unsigned long ret, unsigned long *retp)
 {
-       struct ftrace_ret_stack *ret_stack;
        unsigned long return_handler = (unsigned 
long)dereference_kernel_function_descriptor(return_to_handler);
-       int i = task->curr_ret_stack;
+       int i;
 
        if (ret != return_handler)
                return ret;
@@ -902,7 +901,7 @@ unsigned long ftrace_graph_ret_addr(struct task_struct 
*task, int *idx,
 
        i = *idx ? : task->curr_ret_stack;
        while (i > 0) {
-               ret_stack = get_ret_stack(task, i, &i);
+               struct ftrace_ret_stack *ret_stack = get_ret_stack(task, i, &i);
                if (!ret_stack)
                        break;
                /*
-- 
2.25.1.362.g51ebf55