test/draid: fix error return

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Signed-off-by: Rob Norris <robn@despairlabs.com>
Sponsored-by: https://despairlabs.com/sponsor/
Closes #17551

tests/zfs-tests/cmd/draid.c

@@ -204,7 +204,7 @@ write_map(const char *filename, nvlist_t *allcfgs)
 		error = errno;
 		free(buf);
 		free(tmpname);
-		return (errno);
+		return (error);
 	}
 
 	ssize_t rc, bytes = 0;