ext4: Fix build warning in ext4_dirty_inode()

This fixes the following warning:

fs/ext4/inode.c: In function 'ext4_dirty_inode':
fs/ext4/inode.c:5615: warning: unused variable 'current_handle'

We remove the jbd_debug() statement which does use current_handle, as
it's not terribly important in the grand scheme of things.

Thanks to Stephen Rothwell for pointing this out.
Signed-off-by: NCurt Wohlgemuth <curtw@google.com>
Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>

fs/ext4/inode.c

@@ -5612,14 +5612,12 @@ int ext4_mark_inode_dirty(handle_t *handle, struct inode *inode)
  */
 void ext4_dirty_inode(struct inode *inode)
 {
-	handle_t *current_handle = ext4_journal_current_handle();
 	handle_t *handle;
 
 	handle = ext4_journal_start(inode, 2);
 	if (IS_ERR(handle))
 		goto out;
 
-	jbd_debug(5, "marking dirty.  outer handle=%p\n", current_handle);
 	ext4_mark_inode_dirty(handle, inode);
 
 	ext4_journal_stop(handle);