changed order of else in mdadm to fix resync information.

Hi Elan

As mentioned from in Issue #24, the mdadm check stays on failed disk, even if it's resyncing or resync delayed.

I changed the order in the if statement which fixes this issue.

Example how it look with the changed order:

When one md device is OK, and the other one is rebuilding:

```
# perl check_raid.pl
WARNING: mdstat:[md1(927.52 GiB raid1):UU, md0(203.81 MiB raid1):_U (recovery:0.2% 11K/sec ETA: 286.2min)]
```
```
# cat /proc/mdstat 
Personalities : [raid1] 
md1 : active raid1 sda2[0] sdb2[1]
      972574976 blocks [2/2] [UU]
      
md0 : active raid1 sda1[2] sdb1[1]
      208704 blocks [2/1] [_U]
      [>....................]  recovery =  0.4% (1024/208704) finish=276.9min speed=12K/sec
      
unused devices: <none>
```
When one md device is resyncing and the other is set faulty or removed:
```
# perl check_raid_new.pl
CRITICAL: mdstat:[md1(927.52 GiB raid1):F::_U, md0(203.81 MiB raid1):_U (recovery:3.4% 12K/sec ETA: 268.3min)]
```
```
# cat /proc/mdstat 
Personalities : [raid1] 
md1 : active raid1 sdb2[1]
      972574976 blocks [2/1] [_U]
      
md0 : active raid1 sda1[2] sdb1[1]
      208704 blocks [2/1] [_U]
      [>....................]  recovery =  3.6% (7680/208704) finish=259.6min speed=12K/sec
      
unused devices: <none>
```
When both md devices are resyincing (or planing to resync)
```
# perl check_raid_new.pl
WARNING: mdstat:[md1(927.52 GiB raid1):_U (resync=DELAYED), md0(203.81 MiB raid1):_U (recovery:3.9% 12K/sec ETA: 267.3min)]
```
```
# cat /proc/mdstat 
Personalities : [raid1] 
md1 : active raid1 sda2[2] sdb2[1]
      972574976 blocks [2/1] [_U]
        resync=DELAYED
      
md0 : active raid1 sda1[2] sdb1[1]
      208704 blocks [2/1] [_U]
      [>....................]  recovery =  3.9% (8448/208704) finish=267.0min speed=12K/sec
      
unused devices: <none>
```