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FindOpenMP: Avoid warning in check code
The test code added by commit v3.12.0-rc1~411^2~1 (FindOpenMP: Verify in test source that OMP library is linked, 2018-03-01) leaves an unused variable warning. This breaks the check with `-Werror`. Remove the variable and leave just the function call, which should still check that the OMP library is linked. Fixes: #18102
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@ -126,7 +126,7 @@ set(OpenMP_C_CXX_TEST_SOURCE
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#include <omp.h>
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int main() {
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#ifdef _OPENMP
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int n = omp_get_max_threads();
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omp_get_max_threads();
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return 0;
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#else
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breaks_on_purpose
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