[PATCH 8/9] dax: fix empty-body warnings in bus.c

[Randy Dunlap]

Fix gcc empty-body warning when -Wextra is used:

../drivers/dax/bus.c:93:27: warning: suggest braces around empty body in an ‘else’ statement [-Wempty-body]
../drivers/dax/bus.c:98:29: warning: suggest braces around empty body in an ‘else’ statement [-Wempty-body]

Signed-off-by: Randy Dunlap <rdunlap at infradead.org>
Cc: Dan Williams <dan.j.williams at intel.com>
Cc: Vishal Verma <vishal.l.verma at intel.com>
Cc: Dave Jiang <dave.jiang at intel.com>
Cc: linux-nvdimm at lists.01.org
Cc: Linus Torvalds <torvalds at linux-foundation.org>
Cc: Andrew Morton <akpm at linux-foundation.org>
---
 drivers/dax/bus.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- linux-next-20200417.orig/drivers/dax/bus.c
+++ linux-next-20200417/drivers/dax/bus.c
@@ -2,6 +2,7 @@
 /* Copyright(c) 2017-2018 Intel Corporation. All rights reserved. */
 #include <linux/memremap.h>
 #include <linux/device.h>
+#include <linux/kernel.h>
 #include <linux/mutex.h>
 #include <linux/list.h>
 #include <linux/slab.h>
@@ -90,12 +91,12 @@ static ssize_t do_id_store(struct device
 			} else
 				rc = -ENOMEM;
 		} else
-			/* nothing to remove */;
+			do_empty(); /* nothing to remove */
 	} else if (action == ID_REMOVE) {
 		list_del(&dax_id->list);
 		kfree(dax_id);
 	} else
-		/* dax_id already added */;
+		do_empty(); /* dax_id already added */
 	mutex_unlock(&dax_bus_lock);
 
 	if (rc < 0)