[2.6 patch] make ocfs2_downconvert_thread() static

This patch makes the needlessly global ocfs2_downconvert_thread()
static.
Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>

fs/ocfs2/dlmglue.c

@@ -3356,7 +3356,7 @@ static int ocfs2_downconvert_thread_should_wake(struct ocfs2_super *osb)
 	return should_wake;
 }
 
-int ocfs2_downconvert_thread(void *arg)
+static int ocfs2_downconvert_thread(void *arg)
 {
 	int status = 0;
 	struct ocfs2_super *osb = arg;