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James LambWes McKinney
1532f1d8c63
James Lamb authored and Wes McKinney committed 7abda6d0898
ARROW-3527: [R] remove unused variables

I'm so excited about the Arrow R package! Started working with it tonight to see where I may be able to help.

While doing this, I noticed a few "unused variable" compiler warnings.

```
DataType.cpp:118:7: warning: unused variable 'n' [-Wunused-variable]
int n = x.size();

RecordBatch.cpp:132:7: warning: unused variable 'nc' [-Wunused-variable]
int nc = tbl.size();
```

Please consider this PR to remove the offending lines.

Author: James Lamb <jaylamb20@gmail.com>

Closes #2768 from jameslamb/unused_variables and squashes the following commits:

bee588390 <James Lamb> ARROW-3527:  remove unused variables