regulator: core: Fix regualtor_ena_gpio_free not to access pin after freeing

After freeing pin from regulator_ena_gpio_free, loop can access
the pin. So this patch fixes not to access pin after freeing.

Change-Id: I07af3bb372af87c9f7587155edfb6e527e81d203
Signed-off-by: Seung-Woo Kim <sw0312.kim@samsung.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git


Git-commit: 60a2362f769cf549dc466134efe71c8bf9fbaaba
Signed-off-by: Trilok Soni <tsoni@codeaurora.org>