no need to redefine again and again inside loop

Signed-off-by: Steven Armstrong <steven@icarus.ethz.ch>

bin/cdist

@@ -354,8 +354,8 @@ class Cdist:
 
    def link_type_to_emulator(self):
       """Link type names to cdist-type-emulator"""
+      source = sys.argv[0]
       for type in self.list_types():
-         source = sys.argv[0]
          destination = os.path.join(self.bin_dir, type)
          log.debug("Linking %s to %s", source, destination)
          os.symlink(source, destination)