unicode: mark the version field in struct unicode_map unsigned

unicode version tripplets are always unsigned.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Gabriel Krisman Bertazi <krisman@collabora.com>
Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com>

include/linux/unicode.h

@@ -6,7 +6,7 @@
 #include <linux/dcache.h>
 
 struct unicode_map {
-	int version;
+	unsigned int version;
 };
 
 int utf8_validate(const struct unicode_map *um, const struct qstr *str);