f2fs: remove unnecessary kmap/kunmap operations

The allocated page used by the recovery is not on HIGHMEM, so that we don't
need to use kmap/kunmap.
Signed-off-by: NJaegeuk Kim <jaegeuk.kim@samsung.com>

fs/f2fs/recovery.c

@@ -40,11 +40,11 @@ static struct fsync_inode_entry *get_fsync_inode(struct list_head *head,
 
 static int recover_dentry(struct page *ipage, struct inode *inode)
 {
-	struct f2fs_node *raw_node = (struct f2fs_node *)kmap(ipage);
+	void *kaddr = page_address(ipage);
+	struct f2fs_node *raw_node = (struct f2fs_node *)kaddr;
 	struct f2fs_inode *raw_inode = &(raw_node->i);
 	nid_t pino = le32_to_cpu(raw_inode->i_pino);
 	struct qstr name;
-	struct f2fs_dir_entry *de;
 	struct page *page;
 	struct inode *dir;
 	int err = 0;
@@ -62,8 +62,7 @@ static int recover_dentry(struct page *ipage, struct inode *inode)
 	name.len = le32_to_cpu(raw_inode->i_namelen);
 	name.name = raw_inode->i_name;
 
-	de = f2fs_find_entry(dir, &name, &page);
-	if (de) {
+	if (f2fs_find_entry(dir, &name, &page)) {
 		kunmap(page);
 		f2fs_put_page(page, 0);
 	} else {
@@ -73,7 +72,6 @@ static int recover_dentry(struct page *ipage, struct inode *inode)
 	f2fs_msg(inode->i_sb, KERN_NOTICE, "recover_inode and its dentry: "
 			"ino = %x, name = %s, dir = %lx, err = %d",
 			ino_of_node(ipage), raw_inode->i_name, dir->i_ino, err);
-	kunmap(ipage);
 	return err;
 }