softmmu/device_tree: Remove redundant pointer assignment

softmmu/device_tree: Remove redundant pointer assignment

The pointer assignment "const char *p = path;" in function
qemu_fdt_add_path is unnecessary. Let's remove it and just
use the "path" passed in. No functional change.

Suggested-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Yanan Wang <wangyanan55@huawei.com>
Reviewed-by: Andrew Jones <drjones@redhat.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-id: 20220111032758.27804-1-wangyanan55@huawei.com
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>