##### 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)
from __future__ import absolute_import, division, print_function
__metaclass__ = type
ANSIBLE_METADATA = {'metadata_version': '1.1',
                    'status': ['stableinterface'],
                    'supported_by': 'core'}
DOCUMENTATION = '''
---
module: sysctl
short_description: Manage entries in sysctl.conf.
description:
    - This module manipulates sysctl entries and optionally performs a C(/sbin/sysctl -p) after changing them.
version_added: "1.0"
options:
    name:
        description:
            - The dot-separated path (aka I(key)) specifying the sysctl variable.
        required: true
        aliases: [ 'key' ]
    value:
        description:
            - Desired value of the sysctl key.
        aliases: [ 'val' ]
    state:
        description:
            - Whether the entry should be present or absent in the sysctl file.
        choices: [ "present", "absent" ]
        default: present
    ignoreerrors:
        description: