ceph: clean up header guards

Signed-off-by: Sage Weil <sage@newdream.net>
diff --git a/fs/ceph/rados.h b/fs/ceph/rados.h
index 8fcc023..20b5b45 100644
--- a/fs/ceph/rados.h
+++ b/fs/ceph/rados.h
@@ -1,5 +1,5 @@
-#ifndef __RADOS_H
-#define __RADOS_H
+#ifndef CEPH_RADOS_H
+#define CEPH_RADOS_H
 
 /*
  * Data types for the Ceph distributed object storage layer RADOS