debugfs: remove redundant initialization of dentry

We already initialize it to NULL when declaring it, no need to do
that twice.
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

fs/debugfs/inode.c

@@ -322,7 +322,6 @@ static struct dentry *__create_file(const char *name, umode_t mode,
 	if (!parent)
 		parent = debugfs_mount->mnt_root;
 
-	dentry = NULL;
 	mutex_lock(&parent->d_inode->i_mutex);
 	dentry = lookup_one_len(name, parent, strlen(name));
 	if (!IS_ERR(dentry)) {