intel/compiler: Initialize SIMDSelectionTest member error.

Fix defect reported by Coverity Scan.

Uninitialized pointer field (UNINIT_CTOR)
uninit_member: Non-static class member error is not initialized
in this constructor nor in any functions that it calls.

Fixes: 7558340ebb ("intel/compiler: Add helpers to select SIMD for compute shaders")
Signed-off-by: Vinson Lee <vlee@freedesktop.org>
Reviewed-by: Caio Marcelo de Oliveira Filho <caio.oliveira@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/13608>

src/intel/compiler/test_simd_selection.cpp

@@ -41,7 +41,7 @@ const bool not_spilled = false;
 
 class SIMDSelectionTest : public ::testing::Test {
 protected:
-   SIMDSelectionTest() {
+   SIMDSelectionTest() : error{NULL, NULL, NULL} {
       mem_ctx = ralloc_context(NULL);
       devinfo = rzalloc(mem_ctx, intel_device_info);
       prog_data = rzalloc(mem_ctx, struct brw_cs_prog_data);