gpiolib: devprop: Fix syntax error

EXPORT_SYMBOL_GPL() needs a semicolon at the end, also
explicitly include <linux/export.h> as well.

Fixes: 64ebde5b ("gpiolib: export devprop_gpiochip_set_names()")
Acked-by: Jan Kundrát <jan.kundrat@cesnet.cz>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpiolib-devprop.c

@@ -10,6 +10,7 @@
 #include <linux/slab.h>
 #include <linux/gpio/consumer.h>
 #include <linux/gpio/driver.h>
+#include <linux/export.h>
 
 #include "gpiolib.h"
 
@@ -56,5 +57,4 @@ void devprop_gpiochip_set_names(struct gpio_chip *chip,
 
 	kfree(names);
 }
-
-EXPORT_SYMBOL_GPL(devprop_gpiochip_set_names)
+EXPORT_SYMBOL_GPL(devprop_gpiochip_set_names);