Fix undeclare use_int8 error

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

transformer_engine/common/gemm/cublaslt_gemm.cu

@@ -1242,6 +1242,9 @@ void nvte_cublas_atomic_gemm(const NVTETensor A, const NVTETensor B, NVTETensor
   const bool use_int8 = is_int8_dtype(inputA->data.dtype) ||
                         is_int8_dtype(inputB->data.dtype);
 
+  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);