Fix backtrace when adding mdraid arrays (#560360)

When doing custom partitioning, and adding an mdraid array, and a pre-existing
array has a minor > 32, we will back trace, this patch fixes this.

1 files changed, 1 insertions, 1 deletions

diff --git a/storage/__init__.py b/storage/__init__.py
index adbcd4d16..a808acda6 100644
--- a/storage/__init__.py
+++ b/storage/__init__.py
@@ -549,7 +549,7 @@ class Storage(object):
         """ Return a list of unused minors for use in RAID. """
         raidMinors = range(0,32)
         for array in self.mdarrays + self.mdcontainers:
-            if array.minor is not None:
+            if array.minor is not None and array.minor in raidMinors:
                 raidMinors.remove(array.minor)
         return raidMinors