[PATCH -next] xen: xenbus: Use helper function IS_ERR_OR_NULL()

[Li Zetao <lizetao1@xxxxxxxxxx>]

Use IS_ERR_OR_NULL() to detect an error pointer or a null pointer
open-coding to simplify the code.

Signed-off-by: Li Zetao <lizetao1@xxxxxxxxxx>
---
 drivers/xen/xenbus/xenbus_probe_frontend.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/xen/xenbus/xenbus_probe_frontend.c 
b/drivers/xen/xenbus/xenbus_probe_frontend.c
index 3f3836cb7279..fcb335bb7b18 100644
--- a/drivers/xen/xenbus/xenbus_probe_frontend.c
+++ b/drivers/xen/xenbus/xenbus_probe_frontend.c
@@ -429,7 +429,7 @@ static void xenbus_check_frontend(char *class, char *dev)
                printk(KERN_DEBUG "XENBUS: frontend %s %s\n",
                                frontend, xenbus_strstate(fe_state));
                backend = xenbus_read(XBT_NIL, frontend, "backend", NULL);
-               if (!backend || IS_ERR(backend))
+               if (IS_ERR_OR_NULL(backend))
                        goto out;
                err = xenbus_scanf(XBT_NIL, backend, "state", "%i", &be_state);
                if (err == 1)
-- 
2.34.1