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xen: xenbus: Use helper function IS_ERR_OR_NULL() 

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@huawei.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Link: https://lore.kernel.org/r/20230817014736.3094289-1-lizetao1@huawei.com
Signed-off-by: Juergen Gross <jgross@suse.com>
This commit is contained in:
Li Zetao 2023-08-17 09:47:36 +08:00 committed by Juergen Gross
parent 71281ec9c8
commit 035a69586f
1 changed files with 1 additions and 1 deletions
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2
drivers/xen/xenbus/xenbus_probe_frontend.c
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@ -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)