Syntax bugfix.

pym/cl_fill_install.py

@@ -650,9 +650,9 @@ class fillVars(object, glob_attr):
         if self.Get('os_install_root_type') == 'usb-hdd':
             attr = " scandelay=5"
         if self.Get('os_install_mdadm_set') == 'on':
-            attr = += "domdadm"
+            attr += "domdadm"
         if self.Get('os_install_lvm_set') == 'on':
-            attr = += "dolvm"
+            attr += "dolvm"
 
     def get_os_install_kernel_resume(self):
         """install kernel resume parameter"""