More fiddling with the fields of the reader object struct.

Can't rule out error messages longer than 256 chars.

src/vmod_file.c

@@ -98,7 +98,7 @@ struct VPFX(file_reader) {
 	char			*obj_name;
 	char			*errbuf;
 	timer_t			timerid;
-	uint8_t			errlen;
+	unsigned short		errlen;
 };
 
 struct timer_entry {