string: test VIR_STRDUP
string: test VIR_STRDUP

The surest way to avoid regressions is to test documented behavior :)

* tests/virstringtest.c (testStrdup): New test case.

Signed-off-by: Eric Blake <a9da18479c871fe903d9590822cfe2629c6a4d11@redhat.com>

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