staging: rtl8192u: Replace symbolic permissions with octal permissions

Octal permissions should be used instead of symbolic ones for easier
reading.

WARNING: Symbolic permissions 'S_IRUGO | S_IWUSR' are not preferred.
Consider using octal permissions '0644'.
This warning is detected by checkpatch.pl
Signed-off-by: simran singhal <singhalsimran0@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8192u/ieee80211/ieee80211_module.c

@@ -283,8 +283,7 @@ int __init ieee80211_debug_init(void)
 				" proc directory\n");
 		return -EIO;
 	}
-	e = proc_create("debug_level", S_IRUGO | S_IWUSR,
-			      ieee80211_proc, &fops);
+	e = proc_create("debug_level", 0644, ieee80211_proc, &fops);
 	if (!e) {
 		remove_proc_entry(DRV_NAME, init_net.proc_net);
 		ieee80211_proc = NULL;