dzn: Fix 'statement with no effect' warning

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

src/microsoft/vulkan/dzn_pipeline.c

@@ -1474,7 +1474,6 @@ dzn_graphics_pipeline_translate_blend(struct dzn_graphics_pipeline *pipeline,
 
       desc->RenderTarget[i].BlendEnable =
          in_blend->pAttachments[i].blendEnable;
-         in_blend->logicOpEnable;
       desc->RenderTarget[i].RenderTargetWriteMask =
          in_blend->pAttachments[i].colorWriteMask;
 

src/microsoft/vulkan/meson.build

@@ -65,6 +65,7 @@ if cc.get_argument_syntax() != 'msvc'
   dzn_flags += [
     '-Werror=unused-variable',
     '-Werror=unused-but-set-variable',
+    '-Werror=unused-value',
   ]
 endif