reset: Avoid a warning in devm_reset_bulk_get_by_node()

The devres_alloc() function is intended to avoid the need for freeing
memory, although in practice it may not be enabled, thus leading to a true
leak.

Nevertheless this is intended. Add a comment to explain this.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reported-by: Coverity (CID: 312952)
diff --git a/drivers/reset/reset-uclass.c b/drivers/reset/reset-uclass.c
index 8caa616..c09c009 100644
--- a/drivers/reset/reset-uclass.c
+++ b/drivers/reset/reset-uclass.c
@@ -325,6 +325,8 @@
 	bulk = devres_alloc(devm_reset_bulk_release,
 			    sizeof(struct reset_ctl_bulk),
 			    __GFP_ZERO);
+
+	/* this looks like a leak, but devres takes care of it */
 	if (unlikely(!bulk))
 		return ERR_PTR(-ENOMEM);