IB/srpt: Fix ERR_PTR() vs. NULL checking confusion

transport_init_session() and target_fabric_configfs_init() don't
return NULL pointers, they only return ERR_PTRs or valid pointers.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>

drivers/infiniband/ulp/srpt/ib_srpt.c

@@ -2595,7 +2595,7 @@ static int srpt_cm_req_recv(struct ib_cm_id *cm_id,
 	}
 
 	ch->sess = transport_init_session();
-	if (!ch->sess) {
+	if (IS_ERR(ch->sess)) {
 		rej->reason = __constant_cpu_to_be32(
 				SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
 		pr_debug("Failed to create session\n");
@@ -4009,10 +4009,10 @@ static int __init srpt_init_module(void)
 		goto out;
 	}
 
-	ret = -ENODEV;
 	srpt_target = target_fabric_configfs_init(THIS_MODULE, "srpt");
-	if (!srpt_target) {
+	if (IS_ERR(srpt_target)) {
 		printk(KERN_ERR "couldn't register\n");
+		ret = PTR_ERR(srpt_target);
 		goto out;
 	}