##### SUMMARY

```
master:/usr/local/lib/python2.7/site-packages/ansible/modules/system/sysctl.py", line 297, in reload_sysctl
UnboundLocalError: local variable 'err' referenced before assignment
```

- Bug exists in Ansible 2.7.11 and the latest git repo
- Related source file: https://github.com/ansible/ansible/blob/devel/lib/ansible/modules/system/sysctl.py#L278

##### ISSUE TYPE
- Bug Report

##### COMPONENT NAME

- sysctl

##### ANSIBLE VERSION
```paste below
$ ansible --version
ansible 2.7.11
  config file = /Users/zhb/projects/pro/ansible.cfg
  configured module search path = [u'/Users/zhb/.ansible/plugins/modules', u'/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/local/lib/python2.7/site-packages/ansible
  executable location = /usr/local/bin/ansible
  python version = 2.7.16 (default, May 24 2019, 09:49:36) [GCC 4.2.1 Compatible Apple LLVM 10.0.1 (clang-1001.0.46.4)]
```

##### OS / ENVIRONMENT

- Host OS: macOS 10.14.5
- Target OS: OpenBSD 6.5 (amd64)
self.fix_lines()
        
        if self.file_values[thisname] is None and self.args['state'] == "present":
            self.changed = True
            self.write_file = True
        elif self.file_values[thisname] is None and self.args['state'] == "absent":
            self.changed = False
        elif self.file_values[thisname] and self.args['state'] == "absent":
            self.changed = True
            self.write_file = True
        elif self.file_values[thisname] != self.args['value']:
            self.changed = True
            self.write_file = True
        
        if self.args['sysctl_set']:
            if self.proc_value is None:
                self.changed = True
            elif not self._values_is_equal(self.proc_value, self.args['value']):
                self.changed = True
                self.set_proc = True
        
        if not self.module.check_mode:
            if self.write_file:
                self.write_sysctl()
            if self.write_file and self.args['reload']:
                self.reload_sysctl()
            if self.set_proc:
                self.set_token_value(self.args['name'], self.args['value'])
    def _values_is_equal(self, a, b):