f2fs: delete unnecessary wait for page writeback

no need to wait inline file page writeback for no one
use it, so this patch delete unnecessary wait.
Signed-off-by: NYunlei He <heyunlei@huawei.com>
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/inline.c

@@ -124,8 +124,7 @@ int f2fs_convert_inline_page(struct dnode_of_data *dn, struct page *page)
 	if (err)
 		return err;
 
-	f2fs_wait_on_page_writeback(page, DATA, true);
-
+	f2fs_bug_on(F2FS_P_SB(page), PageWriteback(page));
 	if (PageUptodate(page))
 		goto no_update;