rapidio: add check for rio_add_net() in rio_scan_alloc_net()

rapidio: add check for rio_add_net() in rio_scan_alloc_net()

The return value of rio_add_net() should be checked.  If it fails,
put_device() should be called to free the memory and give up the reference
initialized in rio_add_net().

Link: https://lkml.kernel.org/r/20250227041131.3680761-1-haoxiang_li2024@163.com
Fixes: e6b585ca6e81 ("rapidio: move net allocation into core code")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Haoxiang Li <haoxiang_li2024@163.com>
Cc: Alexandre Bounine <alex.bou9@gmail.com>
Cc: Matt Porter <mporter@kernel.crashing.org>
Cc: Dan Carpenter <dan.carpenter@linaro.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>