minixfs: Use dir_put_page() in minix_unlink() and minix_rename()

... rather than open-coding it there.  Counterpart of the
corresponding fs/sysv commit from Fabio's series...
Reviewed-by: Fabio M. De Francesco <fabio.maria.de.francesco@linux.intel.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/minix/dir.c

@@ -26,12 +26,6 @@ const struct file_operations minix_dir_operations = {
 	.fsync		= generic_file_fsync,
 };
 
-static inline void dir_put_page(struct page *page)
-{
-	kunmap(page);
-	put_page(page);
-}
-
 /*
  * Return the offset into page `page_nr' of the last valid
  * byte in that page, plus one.

fs/minix/minix.h

@@ -64,6 +64,11 @@ extern int V2_minix_get_block(struct inode *, long, struct buffer_head *, int);
 extern unsigned V1_minix_blocks(loff_t, struct super_block *);
 extern unsigned V2_minix_blocks(loff_t, struct super_block *);
 
+static inline void dir_put_page(struct page *page)
+{
+	kunmap(page);
+	put_page(page);
+}
 extern struct minix_dir_entry *minix_find_entry(struct dentry*, struct page**);
 extern int minix_add_link(struct dentry*, struct inode*);
 extern int minix_delete_entry(struct minix_dir_entry*, struct page*);

fs/minix/namei.c

@@ -149,8 +149,7 @@ static int minix_unlink(struct inode * dir, struct dentry *dentry)
 	if (!de)
 		return -ENOENT;
 	err = minix_delete_entry(de, page);
-	kunmap(page);
-	put_page(page);
+	dir_put_page(page);
 
 	if (err)
 		return err;
@@ -242,13 +241,10 @@ static int minix_rename(struct mnt_idmap *idmap,
 			inode_dec_link_count(old_dir);
 	}
 out_dir:
-	if (dir_de) {
-		kunmap(dir_page);
-		put_page(dir_page);
-	}
+	if (dir_de)
+		dir_put_page(dir_page);
 out_old:
-	kunmap(old_page);
-	put_page(old_page);
+	dir_put_page(old_page);
 out:
 	return err;
 }