[mlir] Fix a -Wunused-variable warning, NFC

diff --git a/mlir/lib/Dialect/Linalg/Transforms/Promotion.cpp b/mlir/lib/Dialect/Linalg/Transforms/Promotion.cpp
index abc5e00..d2d31f7 100644 (file)
--- a/mlir/lib/Dialect/Linalg/Transforms/Promotion.cpp
+++ b/mlir/lib/Dialect/Linalg/Transforms/Promotion.cpp
@@ -473,7 +473,7 @@ Optional<Value> mlir::linalg::allocateGPUPrivateMemory(
 /// Normal copy to between src and dst.
 LogicalResult mlir::linalg::copyToGPUPrivateMemory(OpBuilder &b, Value src,
                                                    Value dst) {
-  Operation *copyOp = b.create<memref::CopyOp>(src.getLoc(), src, dst);
+  b.create<memref::CopyOp>(src.getLoc(), src, dst);
   return success();
 }