tools/gpio/gpio-event-mon: fix warning

PRIu64 is defined in user space to match libc's uint64_t definition.
However, gpioevent_data structure in the kernel is defined using the
kernel's own __u64 type.

gpio-event-mon.c: In function ‘monitor_device’:
gpio-event-mon.c:102:19: warning: format ‘%lu’ expects argument of type
    ‘long unsigned int’, but argument 3 has type ‘__u64 {aka long long
    unsigned int}’ [-Wformat=]
   fprintf(stdout, "GPIO EVENT %" PRIu64 ": ", event.timestamp);
                   ^~~~~~~~~~~~~~
  LD       /tmp/kselftest/gpiogpio-event-mon-in.o
  LINK     /tmp/kselftest/gpiogpio-event-mon

Fix is to replace PRIu64 with llu, which we know is what the kernel uses
for __u64.
Signed-off-by: Anders Roxell <anders.roxell@linaro.org>
Tested-by: Daniel Díaz <daniel.diaz@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

tools/gpio/gpio-event-mon.c

@@ -99,7 +99,7 @@ int monitor_device(const char *device_name,
 			ret = -EIO;
 			break;
 		}
-		fprintf(stdout, "GPIO EVENT %" PRIu64 ": ", event.timestamp);
+		fprintf(stdout, "GPIO EVENT %llu: ", event.timestamp);
 		switch (event.id) {
 		case GPIOEVENT_EVENT_RISING_EDGE:
 			fprintf(stdout, "rising edge");