Fix undeclare use_int8 error

Signed-off-by: wenjh <wenjh@sugon.com>

transformer_engine/common/gemm/cublaslt_gemm.cu

@@ -883,6 +883,9 @@ void nvte_cublas_atomic_gemm(const NVTETensor A, const NVTETensor B, NVTETensor
     NVTE_ERROR("TT layout not allowed.");
   }
 
+  const bool use_int8 = is_int8_dtype(inputA->data.dtype) ||
+                        is_int8_dtype(inputB->data.dtype);
+  
   const char *NVTE_FORCE_ROCM_GEMM = std::getenv("NVTE_FORCE_ROCM_GEMM");
   const bool use_fp8 = is_fp8_dtype(inputA->data.dtype) ||
                        is_fp8_dtype(inputB->data.dtype);