zdtm/maps007: send SIGTERM to stop a child process
zdtm/maps007: send SIGTERM to stop a child process

It's typo fix. SIGTERM generates code dump and it's a reason
why this test fails by timeout sometimes.

Signed-off-by: Andrew Vagin <74c05afa918858348d6db8037d82fa8124870113@openvz.org>
Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@parallels.com>

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