f2fs: avoid needless sync_inode_page when reading inline_data

In write_begin, if there is an inline_data, f2fs loads it into 0'th data page.
Since it's the read path, we don't need to sync its inode page.
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/data.c

@@ -1464,7 +1464,6 @@ static int prepare_write_begin(struct f2fs_sb_info *sbi,
 			read_inline_data(page, ipage);
 			set_inode_flag(F2FS_I(inode), FI_DATA_EXIST);
 			set_inline_node(ipage);
-			sync_inode_page(&dn);
 		} else {
 			err = f2fs_convert_inline_page(&dn, page);
 			if (err)