pinctrl: core: Make pinctrl_release static

'pinctrl_release' is used only in this file. Hence make it static.

Without this patch we get the following sparse error:
drivers/pinctrl/core.c:815:6: warning:
symbol 'pinctrl_release' was not declared. Should it be static?

Change-Id: I40b4efdd14653e43339a40ff752b70c34a9d2481
Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Git-commint: 2917e8338c9b8fbd7374621a3291004984590d21
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Signed-off-by: Hanumant Singh <hanumant@codeaurora.org>
diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c
index 5a2fe9a..b0a8e9a 100644
--- a/drivers/pinctrl/core.c
+++ b/drivers/pinctrl/core.c
@@ -812,7 +812,7 @@
  * pinctrl_release() - release the pinctrl handle
  * @kref: the kref in the pinctrl being released
  */
-void pinctrl_release(struct kref *kref)
+static void pinctrl_release(struct kref *kref)
 {
 	struct pinctrl *p = container_of(kref, struct pinctrl, users);