RDMA/rxe: Replace exists by rxe in rxe.c

'exists' looks like a boolean. This patch replaces it by the
normal name used for the rxe device, 'rxe', which should be a
little less confusing. The second rxe_dbg() message is
incorrect since rxe is known to be NULL and this will cause a
seg fault if this message were ever sent. Replace it by pr_debug
for the moment.

Fixes: c6aba5e ("RDMA/rxe: Replace pr_xxx by rxe_dbg_xxx in rxe.c")
Link: https://lore.kernel.org/r/20230303221623.8053-2-rpearsonhpe@gmail.com
Signed-off-by: Bob Pearson <rpearsonhpe@gmail.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

Author: Bob Pearson

drivers/infiniband/sw/rxe/rxe.c

@@ -175,7 +175,7 @@ int rxe_add(struct rxe_dev *rxe, unsigned int mtu, const char *ibdev_name)
 
 static int rxe_newlink(const char *ibdev_name, struct net_device *ndev)
 {
-	struct rxe_dev *exists;
+	struct rxe_dev *rxe;
 	int err = 0;
 
 	if (is_vlan_dev(ndev)) {
@@ -184,17 +184,17 @@ static int rxe_newlink(const char *ibdev_name, struct net_device *ndev)
 		goto err;
 	}
 
-	exists = rxe_get_dev_from_net(ndev);
-	if (exists) {
-		ib_device_put(&exists->ib_dev);
-		rxe_dbg(exists, "already configured on %s\n", ndev->name);
+	rxe = rxe_get_dev_from_net(ndev);
+	if (rxe) {
+		ib_device_put(&rxe->ib_dev);
+		rxe_dbg(rxe, "already configured on %s\n", ndev->name);
 		err = -EEXIST;
 		goto err;
 	}
 
 	err = rxe_net_add(ibdev_name, ndev);
 	if (err) {
-		rxe_dbg(exists, "failed to add %s\n", ndev->name);
+		pr_debug("failed to add %s\n", ndev->name);
 		goto err;
 	}
 err: