[mlir][affine] NFC: Improve variable name in TestReifyValueBounds

Author: antiagainst

mlir/test/lib/Dialect/Affine/TestReifyValueBounds.cpp

@@ -188,11 +188,11 @@ static LogicalResult testEquality(func::FuncOp funcOp) {
         return WalkResult::skip();
       }
       if (op->hasAttr("compose")) {
-        FailureOr<int64_t> equal = affine::fullyComposeAndComputeConstantDelta(
+        FailureOr<int64_t> delta = affine::fullyComposeAndComputeConstantDelta(
             op->getOperand(0), op->getOperand(1));
-        if (failed(equal)) {
+        if (failed(delta)) {
           op->emitError("could not determine equality");
-        } else if (*equal == 0) {
+        } else if (*delta == 0) {
           op->emitRemark("equal");
         } else {
           op->emitRemark("different");