gpio: Fix the no return statement warning

In commit 242587616710 ("gpiolib: Add support for the irqdomain which
doesn't use irq_fwspec as arg") we have changed the return type of
gpiochip_populate_parent_fwspec_twocell/fourcell() from void to void *,
but forgot to add a return statement for these two dummy functions.
Add "return NULL" to fix the build warnings.

Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Kevin Hao <haokexin@gmail.com>
Link: https://lore.kernel.org/r/20200116095003.30324-1-haokexin@gmail.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h
index 9bb4346..00d9f5b 100644 (file)
--- a/include/linux/gpio/driver.h
+++ b/include/linux/gpio/driver.h
@@ -549,12 +549,14 @@ static inline void *gpiochip_populate_parent_fwspec_twocell(struct gpio_chip *ch
                                                    unsigned int parent_hwirq,
                                                    unsigned int parent_type)
 {
+       return NULL;
 }
 
 static inline void *gpiochip_populate_parent_fwspec_fourcell(struct gpio_chip *chip,
                                                     unsigned int parent_hwirq,
                                                     unsigned int parent_type)
 {
+       return NULL;
 }
 
 #endif /* CONFIG_IRQ_DOMAIN_HIERARCHY */