[PATCH] gpiolib: fix link error when sysfs is not built

[Alexandre Courbot <gnurou@gmail.com>]

From: Alexandre Courbot <acourbot@nvidia.com>

Fix all compilation errors and warnings triggered by my latest series of
patch on Grant's linux-next branch. Please meld this patch into the culprit
one to avoid ending with a commit that breaks compilation in the git history.

Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
---
 drivers/gpio/gpiolib.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index b24e820..d283e70 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -1087,6 +1087,27 @@ static inline void gpiochip_unexport(struct gpio_chip *chip)
 {
 }
 
+static inline int gpiod_export(struct gpio_desc *desc,
+			       bool direction_may_change)
+{
+	return -ENOSYS;
+}
+
+static inline int gpiod_export_link(struct device *dev, const char *name,
+				    struct gpio_desc *desc)
+{
+	return -ENOSYS;
+}
+
+static inline int gpiod_sysfs_set_active_low(struct gpio_desc *desc, int value)
+{
+	return -ENOSYS;
+}
+
+static inline void gpiod_unexport(struct gpio_desc *desc)
+{
+}
+
 #endif /* CONFIG_GPIO_SYSFS */
 
 /*
-- 
1.8.1.3