[mlir] Fix a warning

This patch fixes:

  mlir/lib/Analysis/DataFlow/SparseAnalysis.cpp:321:19: warning:
  unused variable ‘block’ [-Wunused-variable]

diff --git a/mlir/lib/Analysis/DataFlow/SparseAnalysis.cpp b/mlir/lib/Analysis/DataFlow/SparseAnalysis.cpp
index ef44f50adf5e8f74854faada9bfa7d7f94d10453..04d47387403d8e980029bf26dcfcdd0bb62cfc74 100644 (file)
--- a/mlir/lib/Analysis/DataFlow/SparseAnalysis.cpp
+++ b/mlir/lib/Analysis/DataFlow/SparseAnalysis.cpp
@@ -318,7 +318,7 @@ LogicalResult
 AbstractSparseBackwardDataFlowAnalysis::visit(ProgramPoint point) {
   if (Operation *op = point.dyn_cast<Operation *>())
     visitOperation(op);
-  else if (Block *block = point.dyn_cast<Block *>())
+  else if (point.dyn_cast<Block *>())
     // For backward dataflow, we don't have to do any work for the blocks
     // themselves. CFG edges between blocks are processed by the BranchOp
     // logic in `visitOperation`, and entry blocks for functions are tied