Some platforms, such as mips64, don't map __u64 to long long unsigned
int so using %llu produces a warning:

gpio-event-mon.c:110:37: warning: format ‘%llu’ expects argument of type ‘long 
long unsigned int’, but argument 3 has type ‘__u64’ {aka ‘long unsigned int’} 
[-Wformat=]
  110 |   fprintf(stdout, "GPIO EVENT at %llu on line %d (%d|%d) ",
      |                                  ~~~^
      |                                     |
      |                                     long long unsigned int
      |                                  %lu
  111 |    event.timestamp_ns, event.offset, event.line_seqno,
      |    ~~~~~~~~~~~~~~~~~~
      |         |
      |         __u64 {aka long unsigned int}

Replace the %llu with PRIu64 and cast the argument to uint64_t.

Fixes: commit 03fd11b03362 ("tools/gpio/gpio-event-mon: fix warning")
Signed-off-by: Kent Gibson <warthog...@gmail.com>
---
 tools/gpio/gpio-event-mon.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/gpio/gpio-event-mon.c b/tools/gpio/gpio-event-mon.c
index cacd66ad7926..a2b233fdb572 100644
--- a/tools/gpio/gpio-event-mon.c
+++ b/tools/gpio/gpio-event-mon.c
@@ -107,8 +107,8 @@ int monitor_device(const char *device_name,
                        ret = -EIO;
                        break;
                }
-               fprintf(stdout, "GPIO EVENT at %llu on line %d (%d|%d) ",
-                       event.timestamp_ns, event.offset, event.line_seqno,
+               fprintf(stdout, "GPIO EVENT at %" PRIu64 " on line %d (%d|%d) ",
+                       (uint64_t)event.timestamp_ns, event.offset, 
event.line_seqno,
                        event.seqno);
                switch (event.id) {
                case GPIO_V2_LINE_EVENT_RISING_EDGE:
-- 
2.30.0

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