The debug file is opened with single_open(), but there's no
single_release().

Signed-off-by: Li Zefan <lize...@huawei.com>
---
 drivers/staging/rtl8192u/ieee80211/ieee80211_module.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/rtl8192u/ieee80211/ieee80211_module.c 
b/drivers/staging/rtl8192u/ieee80211/ieee80211_module.c
index e0870c0..434c431 100644
--- a/drivers/staging/rtl8192u/ieee80211/ieee80211_module.c
+++ b/drivers/staging/rtl8192u/ieee80211/ieee80211_module.c
@@ -268,7 +268,8 @@ static const struct file_operations fops = {
        .open = open_debug_level,
        .read = seq_read,
        .llseek = seq_lseek,
-       .write = write_debug_level
+       .write = write_debug_level,
+       .release = single_release,
 };
 
 int __init ieee80211_debug_init(void)
-- 
1.8.0.2
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