[mlir][sparse] fix compiler warning

[Peiming]

fix typo

[Peiming]

rebase

mlir/lib/Dialect/SparseTensor/Transforms/SparseTensorConversion.cpp

 //       if val != 0
 //         bodyBuilder(v, [i1, ..., ik])
 // TODO: It can be used by other operators (ReshapeOp, ConvertOP) conversion to
 // reduce code repetition!
 static void genDenseTensorIterationLoop(
     ConversionPatternRewriter &rewriter, Location loc, Value t,
     RankedTensorType tensorTp,
     function_ref<void(OpBuilder &, Location, ValueRange)> bodyBuilder) {
-  auto enc = getSparseTensorEncoding(tensorTp);
-  (void) enc;
-  assert(!enc && "Generating Densor Tensor Loop on a Sparse Tensor!");
+  assert(!getSparseTensorEncoding(tensorTp) &&
+         "Generating Dense Tensor Loop on a Sparse Tensor!");
 
   unsigned rank = tensorTp.getRank();
   Value zero = constantIndex(rewriter, loc, 0);
   Value one = constantIndex(rewriter, loc, 1);
 
   SmallVector<Value> lo;
   SmallVector<Value> hi;
   SmallVector<Value> st;