libc: locale: fix collation file size validation

At a minimum, we need enough for the colllation format version string +
locale definition version string and a full collate_info definition,
rather than just the first two and a pointer.

Sponsored by:	Klara, Inc.

lib/libc/locale/collate.c

@@ -159,7 +159,7 @@ __collate_load_tables_l(const char *encoding, struct xlocale_collate *table)
 	}
 	if (sbuf.st_size < (COLLATE_FMT_VERSION_LEN +
 			    XLOCALE_DEF_VERSION_LEN +
-			    sizeof (info))) {
+			    sizeof (*info))) {
 		(void) _close(fd);
 		errno = EINVAL;
 		return (_LDP_ERROR);