[PATCH] Remove unused variable in math/atest-exp2.c.

[Torvald Riegel]

The variable that this patch removes seems to be unused, and the
resulting warning breaks the build when using a recent GCC.

I can't test master with this GCC currently because of other issues in
math/.  Feel free to commit :)

2015-12-17  Torvald Riegel  <triegel@redhat.com>

	* math/atest-exp2.c (mp_exp_m1): Remove.

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