cxl/port: Fix NULL pointer access in devm_cxl_add_port()

commit a70fc4e upstream.

In devm_cxl_add_port() the port creation may fail and its associated
pointer does not contain a valid address. During error message
generation this invalid port address is used. Fix that wrong address
access.

Fixes: f3cd264 ("cxl: Unify debug messages when calling devm_cxl_add_port()")
Signed-off-by: Robert Richter <rrichter@amd.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/20230519215436.3394532-1-rrichter@amd.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/cxl/core/port.c

@@ -717,11 +717,10 @@ struct cxl_port *devm_cxl_add_port(struct device *host, struct device *uport,
 
 	parent_port = parent_dport ? parent_dport->port : NULL;
 	if (IS_ERR(port)) {
-		dev_dbg(uport, "Failed to add %s%s%s%s: %ld\n",
-			dev_name(&port->dev),
-			parent_port ? " to " : "",
+		dev_dbg(uport, "Failed to add%s%s%s: %ld\n",
+			parent_port ? " port to " : "",
 			parent_port ? dev_name(&parent_port->dev) : "",
-			parent_port ? "" : " (root port)",
+			parent_port ? "" : " root port",
 			PTR_ERR(port));
 	} else {
 		dev_dbg(uport, "%s added%s%s%s\n",