fix query path, refs #21547

tests/test_raid.py

@@ -21,7 +21,7 @@ def print_green(string):
     print(GREEN + string + DEF)
 
 def check_raid(dev):
-    cmd = 'mdadm -D /dev/%s' % dev
+    cmd = 'mdadm -D %s' % dev
     status, output = subprocess.getstatusoutput(cmd)
     print(output)
     return status != 0