Fix return code bug in createTypeConformance (shader-slang#1930)

Co-authored-by: Yong He <yhe@nvidia.com>

Author: csyonghe

source/slang/slang.cpp

@@ -1066,8 +1066,9 @@ SLANG_NO_THROW SlangResult SLANG_MCALL Linkage::createTypeConformanceComponentTy
     catch (...)
     {}
     sink.getBlobIfNeeded(outDiagnostics);
+    bool success = (result != nullptr);
     *outConformanceComponentType = result.detach();
-    return result ? SLANG_OK : SLANG_FAIL;
+    return success ? SLANG_OK : SLANG_FAIL;
 }
 
 SLANG_NO_THROW SlangResult SLANG_MCALL Linkage::createCompileRequest(