Description: regulator: core: Fix regualtor_ena_gpio_free not to access pin after freeing
References:
 https://source.android.com/security/bulletin/2017-05-01
Notes:
 bwh> Introduced in 3.10 by commit f19b00da8ed3 "regulator: core: support
 bwh> shared enable GPIO concept"
Bugs:
upstream: released (3.19-rc1) [60a2362f769cf549dc466134efe71c8bf9fbaaba]
4.9-upstream-stable: N/A "Fixed before branching point"
3.16-upstream-stable: released (3.16.45) [702f4dd27ccf3bae7915ef1f8790db3af435d211]
3.2-upstream-stable: N/A "Vulnerable code not present"
sid: released (4.0.2-1)
4.9-stretch-security: N/A "Fixed before branching point"
3.16-jessie-security: released (3.16.43-2+deb8u3) [bugfix/all/regulator-core-Fix-regualtor_ena_gpio_free-not-to-ac.patch]
3.2-wheezy-security: N/A "Vulnerable code not present"