IB/srpt: Remove redundant assignment to ret

Variable 'ret' is set to -ENOMEM but this value is never read as it is
overwritten with a new value later on, hence it is a redundant assignment
and can be removed

In 'commit b79fafac ("target: make queue_tm_rsp() return void")'
srpt_queue_response() has been changed to return void, so after "goto
out", there is no need to return ret.

Clean up the following clang-analyzer warning:

drivers/infiniband/ulp/srpt/ib_srpt.c:2860:3: warning: Value stored to
'ret' is never read [clang-analyzer-deadcode.DeadStores]

Fixes: b99f8e4d ("IB/srpt: convert to the generic RDMA READ/WRITE API")
Link: https://lore.kernel.org/r/1620296105-121964-1-git-send-email-yang.lee@linux.alibaba.comReported-by: NAbaci Robot <abaci@linux.alibaba.com>
Signed-off-by: NYang Li <yang.lee@linux.alibaba.com>
Reviewed-by: NLeon Romanovsky <leonro@nvidia.com>
Reviewed-by: NBart Van Assche <bvanassche@acm.org>
Signed-off-by: NJason Gunthorpe <jgg@nvidia.com>

drivers/infiniband/ulp/srpt/ib_srpt.c

@@ -2858,7 +2858,6 @@ static void srpt_queue_response(struct se_cmd *cmd)
 			&ch->sq_wr_avail) < 0)) {
 		pr_warn("%s: IB send queue full (needed %d)\n",
 				__func__, ioctx->n_rdma);
-		ret = -ENOMEM;
 		goto out;
 	}