Fixes related to handling of GPTs created under Solaris
diff --git a/gptpart.cc b/gptpart.cc
index 130add0..7ac629a 100644
--- a/gptpart.cc
+++ b/gptpart.cc
@@ -90,7 +90,8 @@
 
 // Return 1 if the partition is in use
 int GPTPart::IsUsed(void) {
-   return (firstLBA != UINT64_C(0));
+   return (partitionType != GUIDData("0x00"));
+//   return (firstLBA != UINT64_C(0));
 } // GPTPart::IsUsed()
 
 // Set the type code to the specified one. Also changes the partition