fs: update comment in init_file()

The f_count member in struct file has been replaced by f_ref,
so update f_count to f_ref in the comment.

Signed-off-by: Zhou Yuhang <zhouyuhang@kylinos.cn>
Signed-off-by: Christian Brauner <brauner@kernel.org>

Author: Zhou Yuhang

fs/file_table.c

@@ -192,7 +192,7 @@ static int init_file(struct file *f, int flags, const struct cred *cred)
 	f->f_sb_err	= 0;
 
 	/*
-	 * We're SLAB_TYPESAFE_BY_RCU so initialize f_count last. While
+	 * We're SLAB_TYPESAFE_BY_RCU so initialize f_ref last. While
 	 * fget-rcu pattern users need to be able to handle spurious
 	 * refcount bumps we should reinitialize the reused file first.
 	 */