cxl: Remove checking of iter in cxl_endpoint_get_perf_coordinates()

The while() loop in cxl_endpoint_get_perf_coordinates() checks to see if
'iter' is valid as part of the condition breaking out of the loop.
is_cxl_root() will stop the loop before the next iteration could go NULL.
Remove the iter check.

The presence of the iter or removing the iter does not impact the behavior
of the code. This is a code clean up and not a bug fix.

Reviewed-by: Jonathan Cameron <[email protected]>
Reviewed-by: Davidlohr Bueso <[email protected]>
Reviewed-by: Dan Williams <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Dave Jiang <[email protected]>

Author: davejiang

drivers/cxl/core/port.c

@@ -2197,7 +2197,7 @@ int cxl_endpoint_get_perf_coordinates(struct cxl_port *port,
 	 * port each iteration. If the parent is cxl root then there is
 	 * nothing to gather.
 	 */
-	while (iter && !is_cxl_root(to_cxl_port(iter->dev.parent))) {
+	while (!is_cxl_root(to_cxl_port(iter->dev.parent))) {
 		cxl_coordinates_combine(&c, &c, &dport->sw_coord);
 		c.write_latency += dport->link_latency;
 		c.read_latency += dport->link_latency;