net: hinic: fix memory leak when reading function table

[ Upstream commit 4c1f602d ]

When the input parameter idx meets the expected case option in
hinic_dbg_get_func_table(), read_data is not released. Fix it.

Fixes: 5215e162

 ("hinic: add support to query function table")
Signed-off-by: Zhengchao Shao <shaozhengchao@huawei.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>