fix: normalize local variable name

This commit normalizes the opensuse create_hostname_file variable to
match the other distros.

cloudinit/distros/opensuse.py

@@ -221,13 +221,13 @@ def _set_update_method(self):
                 self.update_method = "zypper"
 
     def _write_hostname(self, hostname, filename):
-        preserve_state = util.get_cfg_option_bool(
+        create_hostname_file = util.get_cfg_option_bool(
             self._cfg, "create_hostname_file"
         )
         if self.uses_systemd() and filename.endswith("/previous-hostname"):
             util.write_file(filename, hostname)
         elif self.uses_systemd():
-            if not preserve_state:
+            if not create_hostname_file:
                 subp.subp(["hostnamectl", "set-hostname", str(hostname)])
             else:
                 subp.subp(
@@ -245,7 +245,7 @@ def _write_hostname(self, hostname, filename):
                 # so lets see if we can read it first.
                 conf = self._read_hostname_conf(filename)
             except IOError:
-                if not preserve_state:
+                if not create_hostname_file:
                     pass
                 else:
                     return