[PATCH] libxl: virtio: Fix build error for 32-bit platforms

[Viresh Kumar <viresh.kumar@xxxxxxxxxx>]

The field 'base' in 'struct libxl_device_virtio' is defined as uint64,
while we are printing it with '%lu', which is 32bit only 32-bit
platforms. And so generates a error like:

  libxl_internal.h:4388:51: error: format '%lu' expects argument of type 'long
  unsigned int', but argument 3 has type 'uint64_t' {aka 'long long unsigned
  int'} [-Werror=format=]

Fix the same by using PRIx64 instead.

Now that the base name is available in hexadecimal format, prefix it
with '0x' as well, which strtoul() also depends upon since base passed
is 0.

Fixes: 43ba5202e2ee ("libxl: add support for generic virtio device")
Signed-off-by: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
---
Couldn't test on 32-bit platforms yet, but works fine for 64 bit one.

 tools/libs/light/libxl_virtio.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/libs/light/libxl_virtio.c b/tools/libs/light/libxl_virtio.c
index 6a38def2faf5..2217bda8a253 100644
--- a/tools/libs/light/libxl_virtio.c
+++ b/tools/libs/light/libxl_virtio.c
@@ -45,12 +45,12 @@ static int libxl__set_xenstore_virtio(libxl__gc *gc, 
uint32_t domid,
     const char *transport = 
libxl_virtio_transport_to_string(virtio->transport);
 
     flexarray_append_pair(back, "irq", GCSPRINTF("%u", virtio->irq));
-    flexarray_append_pair(back, "base", GCSPRINTF("%lu", virtio->base));
+    flexarray_append_pair(back, "base", GCSPRINTF("0x%"PRIx64, virtio->base));
     flexarray_append_pair(back, "type", GCSPRINTF("%s", virtio->type));
     flexarray_append_pair(back, "transport", GCSPRINTF("%s", transport));
 
     flexarray_append_pair(front, "irq", GCSPRINTF("%u", virtio->irq));
-    flexarray_append_pair(front, "base", GCSPRINTF("%lu", virtio->base));
+    flexarray_append_pair(front, "base", GCSPRINTF("0x%"PRIx64, virtio->base));
     flexarray_append_pair(front, "type", GCSPRINTF("%s", virtio->type));
     flexarray_append_pair(front, "transport", GCSPRINTF("%s", transport));
 
-- 
2.31.1.272.g89b43f80a514