f2fs: move a branch for code redability

This patch moves a function in f2fs_delete_entry for code readability.
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>

fs/f2fs/dir.c

@@ -550,12 +550,11 @@ void f2fs_delete_entry(struct f2fs_dir_entry *dentry, struct page *page,
 
 	dir->i_ctime = dir->i_mtime = CURRENT_TIME;
 
-	if (inode && S_ISDIR(inode->i_mode)) {
+	if (inode) {
+		if (S_ISDIR(inode->i_mode)) {
 			drop_nlink(dir);
 			update_inode_page(dir);
 		}
-
-	if (inode) {
 		inode->i_ctime = CURRENT_TIME;
 		drop_nlink(inode);
 		if (S_ISDIR(inode->i_mode)) {