LoongArch: Fix memleak in pci_acpi_scan_root()

[ Upstream commit 5016c3a3 ]

Add kfree(root_ops) in this case to avoid memleak of root_ops,
leaks when pci_find_bus() != 0.

Signed-off-by: Yuli Wang <wangyuli@uniontech.com>
Signed-off-by: Wentao Guan <guanwentao@uniontech.com>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Signed-off-by: Sasha Levin <sashal@kernel.org>