jbd2: JBD_XXX to JBD2_XXX naming cleanup

change JBD_XXX macros to JBD2_XXX in JBD2/Ext4

Signed-off-by: Mingming Cao <cmm@us.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
diff --git a/include/linux/ext4_jbd2.h b/include/linux/ext4_jbd2.h
index d716e63..38c71d3 100644
--- a/include/linux/ext4_jbd2.h
+++ b/include/linux/ext4_jbd2.h
@@ -12,8 +12,8 @@
  * Ext4-specific journaling extensions.
  */
 
-#ifndef _LINUX_EXT4_JBD_H
-#define _LINUX_EXT4_JBD_H
+#ifndef _LINUX_EXT4_JBD2_H
+#define _LINUX_EXT4_JBD2_H
 
 #include <linux/fs.h>
 #include <linux/jbd2.h>
@@ -228,4 +228,4 @@
 	return 0;
 }
 
-#endif	/* _LINUX_EXT4_JBD_H */
+#endif	/* _LINUX_EXT4_JBD2_H */