[PATCH] Fix warning in misc/tst-mntent2.c.

[Torvald Riegel]

This fixes a -Werror failure with a recent GCC build by adding
parentheses.  OK?

2014-12-15  Torvald Riegel  <triegel@redhat.com>

	* misc/tst-mntent2.c (do_test): Fix warning.

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