[PATCH] Double unlock in BSD accounting speedup patch

doh - double unlock in the acct-is-on path. Noticed by Aneesh Kumar K.V
<aneesh.kumar@digital.com>

kernel/acct.c

@@ -406,14 +406,13 @@ void acct_process(long exitcode)
 
 	spin_lock(&acct_globals.lock);
 	file = acct_globals.file;
-	if (!file)
-		goto out_unlock;
-
+	if (unlikely(!file)) {
+		spin_unlock(&acct_globals.lock);
+		return;
+	}
 	get_file(file);
 	spin_unlock(&acct_globals.lock);
+
 	do_acct_process(exitcode, file);
 	fput(file);
-
-out_unlock:
-	spin_unlock(&acct_globals.lock);
 }