commit 1d8f65798240b6577d8c44d20c8ea8f1d429e495 upstream.

The condition should be logical NOT to assign the hook address to parent
address. Because the return value 0 of function_graph_enter upon
success.

Fixes: e949b6db51dc (riscv/function_graph: Simplify with function_graph_enter())
Signed-off-by: NZong Li <zong.li@sifive.com>
Reviewed-by: NSteven Rostedt (VMware) <rostedt@goodmis.org>
Cc: stable@vger.kernel.org
Signed-off-by: NPaul Walmsley <paul.walmsley@sifive.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>