RDMA/erdma: Fix ignored return value of init_kernel_qp

The init_kernel_qp interface may fail. Check its return value and free
related resources properly when it does.

Fixes: 15505577 ("RDMA/erdma: Add verbs implementation")
Reviewed-by: Cheng Xu <chengyou@linux.alibaba.com>
Signed-off-by: Boshi Yu <boshiyu@linux.alibaba.com>
Link: https://patch.msgid.link/20250725055410.67520-3-boshiyu@linux.alibaba.com


Signed-off-by: Leon Romanovsky <leon@kernel.org>