ipmi: fix return value of ipmi_set_my_LUN

mainline inclusion
from mainline-4.20-rc1
commit 060e8fb53fe3455568982d10ab8c3dd605565049
category: bugfix
bugzilla: 6326
CVE: NA

---------------------------

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/char/ipmi/ipmi_msghandler.c: In function 'ipmi_set_my_LUN':
drivers/char/ipmi/ipmi_msghandler.c:1335:13: warning:
 variable 'rv' set but not used [-Wunused-but-set-variable]
  int index, rv = 0;

'rv' should be the correct return value.

Fixes: 048f7c3e ("ipmi: Properly release srcu locks on error conditions")
Signed-off-by: NYueHaibing <yuehaibing@huawei.com>
Signed-off-by: NCorey Minyard <cminyard@mvista.com>
Signed-off-by: NJason Yan <yanaijie@huawei.com>
Reviewed-by: Nzhengbin <zhengbin13@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

drivers/char/ipmi/ipmi_msghandler.c

@@ -1350,7 +1350,7 @@ int ipmi_set_my_LUN(struct ipmi_user *user,
 	}
 	release_ipmi_user(user, index);
 
-	return 0;
+	return rv;
 }
 EXPORT_SYMBOL(ipmi_set_my_LUN);