unicode: move utf8cursor to utf8-selftest.c

Only used by the tests, so no need to keep it in the core.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com>

fs/unicode/utf8-selftest.c

@@ -165,6 +165,12 @@ static ssize_t utf8len(const struct utf8data *data, const char *s)
 	return utf8nlen(data, s, (size_t)-1);
 }
 
+static int utf8cursor(struct utf8cursor *u8c, const struct utf8data *data,
+		const char *s)
+{
+	return utf8ncursor(u8c, data, s, (unsigned int)-1);
+}
+
 static void check_utf8_nfdi(void)
 {
 	int i;