Fix CRLF in sum_op.cu

paddle/operators/sum_op.cu

@@ -13,4 +13,4 @@ limitations under the License. */
 #include "paddle/operators/sum_op.h"
 
 namespace ops = paddle::operators;
-REGISTER_OP_GPU_KERNEL(sum, ops::SumKernel<paddle::platform::GPUPlace, float>);
\ No newline at end of file
+REGISTER_OP_GPU_KERNEL(sum, ops::SumKernel<paddle::platform::GPUPlace, float>);