dzn: Fix printf() format in dxgi_get_factory() error message

Reviewed-by: Jesse Natalie <jenatali@microsoft.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/17250>

src/microsoft/vulkan/dzn_util.c

@@ -273,7 +273,7 @@ dxgi_get_factory(bool debug)
    IDXGIFactory4 *factory;
    HRESULT hr = CreateDXGIFactory2(flags, &IID_IDXGIFactory4, (void **)&factory);
    if (FAILED(hr)) {
-      mesa_loge("CreateDXGIFactory2 failed: %08x\n", hr);
+      mesa_loge("CreateDXGIFactory2 failed: %08x\n", (int32_t)hr);
       return NULL;
    }
 

src/microsoft/vulkan/meson.build

@@ -66,6 +66,7 @@ if cc.get_argument_syntax() != 'msvc'
     '-Werror=unused-variable',
     '-Werror=unused-but-set-variable',
     '-Werror=unused-value',
+    '-Werror=format',
   ]
 endif