locks: give posix_test_lock same interface as ->lock

posix_test_lock() and ->lock() do the same job but have gratuitously
different interfaces.  Modify posix_test_lock() so the two agree,
simplifying some code in the process.

Signed-off-by: Marc Eshel <eshel@almaden.ibm.com>
Signed-off-by: "J. Bruce Fields" <bfields@citi.umich.edu>
diff --git a/fs/gfs2/locking/nolock/main.c b/fs/gfs2/locking/nolock/main.c
index acfbc94..5cc1dfa 100644
--- a/fs/gfs2/locking/nolock/main.c
+++ b/fs/gfs2/locking/nolock/main.c
@@ -164,13 +164,7 @@
 static int nolock_plock_get(void *lockspace, struct lm_lockname *name,
 			    struct file *file, struct file_lock *fl)
 {
-	struct file_lock tmp;
-	int ret;
-
-	ret = posix_test_lock(file, fl, &tmp);
-	fl->fl_type = F_UNLCK;
-	if (ret)
-		memcpy(fl, &tmp, sizeof(struct file_lock));
+	posix_test_lock(file, fl);
 
 	return 0;
 }