octeon_ep: Fix memory leak in octep_device_setup()

octeon_ep: Fix memory leak in octep_device_setup()

In octep_device_setup(), if octep_ctrl_net_init() fails, the function
returns directly without unmapping the mapped resources and freeing the
allocated configuration memory.

Fix this by jumping to the unsupported_dev label, which performs the
necessary cleanup. This aligns with the error handling logic of other
paths in this function.

Compile tested only. Issue found using a prototype static analysis tool
and code review.

Fixes: 577f0d1b1c5f ("octeon_ep: add separate mailbox command and response queues")
Signed-off-by: Zilin Guan <zilin@seu.edu.cn>
Reviewed-by: Vadim Fedorenko <vadim.fedorenko@linux.dev>
Link: https://patch.msgid.link/20260121130551.3717090-1-zilin@seu.edu.cn
Signed-off-by: Jakub Kicinski <kuba@kernel.org>