Fixed the only -Wsometimes-uninitialized warning

Moved the logging into the `if`, which I think is what the author probably intended.

c++/examples/h5tutr_extend.cpp

@@ -99,7 +99,7 @@ main(void)
  // ---------------------------------------
 
  int rdata[10][3];
- int i, j, rank, rank_chunk;
+ int i, j, rank;
  hsize_t chunk_dimsr[2], dimsr[2];
 
  // Open the file and dataset.
@@ -114,10 +114,10 @@ main(void)
  rank = filespace->getSimpleExtentNdims();
  (void)filespace->getSimpleExtentDims(dimsr);
 
- if (H5D_CHUNKED == prop.getLayout())
- rank_chunk = prop.getChunk(rank, chunk_dimsr);
- cout << "rank chunk = " << rank_chunk << endl;
- ;
+ if (H5D_CHUNKED == prop.getLayout()) {
+ int rank_chunk = prop.getChunk(rank, chunk_dimsr);
+  cout << "rank chunk = " << rank_chunk << endl;
+ }
 
  memspace = new DataSpace(rank, dimsr, NULL);
  dataset->read(rdata, PredType::NATIVE_INT, *memspace, *filespace);