zdtm: open with O_CREAT in second argument needs 3 arguments
zdtm: open with O_CREAT in second argument needs 3 arguments

The mode argument must be supplied when O_CREAT is specified in flags.
Otherwise it will cause compile error due to -Werror is specified.

Signed-off-by: Viktor Konyashkin <6983a80108119320fadbdd43e33356d21d5809c3@parallels.com>
Acked-by: Andrew Vagin <74c05afa918858348d6db8037d82fa8124870113@parallels.com>
Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@parallels.com>

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