Fixes a directory creation problem in Windows in the root directory.

HISTORY

@@ -1,6 +1,15 @@
 SnapRAID HISTORY
 ================
 
+3.2 2013/7
+==========
+ * Fix a directory creation problem in Windows when the "disk" option points to
+   the root directory of a drive. Now SnapRAID won't complain about the
+   inability to create such directory.
+   If you encouter this problem when trying to recover your data, just upgrade
+   to this version, and you'll be able to complete the recovering process.
+   No need to upgrade for platforms different than Windows.
+
 3.1 2013/5
 ==========
  * Direct use of Windows API for disk access to improve error reporting.

util.c

@@ -696,6 +696,13 @@ int mkancestor(const char* file)
 		return 0;
 	}
 
+#ifdef _WIN32
+	if (strlen(dir) == 2 && dir[1] == ':') {
+		/* it's a drive specification, nothing more to do */
+		return 0;
+	}
+#endif
+
 	/* try creating it  */
 	if (mkdir(dir, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH) == 0) {
 		/* just created */