test_driver: sanitize user-provided array in testDomainGetDiskErrors
test_driver: sanitize user-provided array in testDomainGetDiskErrors

Zero out the user provided memory in order to avoid potentially freeing
uninitialized memory.

Signed-off-by: Ilias Stamatis <3ef66acc2700f2eb6746a592b321628ebd41accf@gmail.com>
Reviewed-by: Erik Skultety <2c14d38fa47c8799f1b9c16280abe27f8edfec6e@redhat.com>

eskultety/libvirt,andreabolognani/libvirt,jfehlig/libvirt,olafhering/libvirt,jardasgit/libvirt,zippy2/libvirt,zippy2/libvirt,nertpinx/libvirt,libvirt/libvirt,andreabolognani/libvirt,nertpinx/libvirt,olafhering/libvirt,fabianfreyer/libvirt,nertpinx/libvirt,zippy2/libvirt,andreabolognani/libvirt,fabianfreyer/libvirt,eskultety/libvirt,olafhering/libvirt,nertpinx/libvirt,jardasgit/libvirt,jfehlig/libvirt,jardasgit/libvirt,eskultety/libvirt,fabianfreyer/libvirt,olafhering/libvirt,jardasgit/libvirt,jfehlig/libvirt,nertpinx/libvirt,crobinso/libvirt,libvirt/libvirt,jardasgit/libvirt,andreabolognani/libvirt,libvirt/libvirt,crobinso/libvirt,libvirt/libvirt,eskultety/libvirt,eskultety/libvirt,crobinso/libvirt,zippy2/libvirt,andreabolognani/libvirt,fabianfreyer/libvirt,crobinso/libvirt,fabianfreyer/libvirt,jfehlig/libvirt