d3dcompiler: Always initialize output shader blob pointer in D3DCompile2().

dlls/d3dcompiler_43/compiler.c

@@ -462,6 +462,8 @@ HRESULT WINAPI D3DCompile2(const void *data, SIZE_T data_size, const char *filen
     if (secondary_flags)
         FIXME("Ignoring secondary flags %#x.\n", secondary_flags);
 
+    if (shader_blob)
+        *shader_blob = NULL;
     if (messages_blob)
         *messages_blob = NULL;
 

dlls/d3dcompiler_43/tests/hlsl_d3d9.c

@@ -1412,7 +1412,8 @@ static void test_fail(void)
     {
         for (i = 0; i < ARRAY_SIZE(tests); ++i)
         {
-            compiled = errors = NULL;
+            errors = NULL;
+            compiled = (void *)0xdeadbeef;
             hr = D3DCompile(tests[i], strlen(tests[i]), NULL, NULL, NULL, "test", targets[j], 0, 0, &compiled, &errors);
             ok(hr == E_FAIL, "Test %u, target %s: Got unexpected hr %#lx.\n", i, targets[j], hr);
             ok(!!errors, "Test %u, target %s, expected non-NULL error blob.\n", i, targets[j]);