Fix compile error in Detail.c

'avail' is undefined if '--export', so make sure we don't try to use
it.


### Diffstat output
 ./Detail.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff .prev/Detail.c ./Detail.c
--- .prev/Detail.c	2007-05-21 14:25:50.000000000 +1000
+++ ./Detail.c	2007-05-22 08:57:59.000000000 +1000
@@ -377,12 +377,12 @@ This is pretty boring
 
 	if (brief > 1 && devices) printf("\n   devices=%s", devices);
 	if (brief) printf("\n");
-out:
 	if (test &&
 	    !enough(array.level, array.raid_disks, array.layout,
 		    1, avail, avail_disks))
 		rv = 2;
 
+out:
 	close(fd);
 	return rv;
 }