Missing signal sending permission check on failed query messagesHEADmaster

When run as setuid root, one can send a query message to the
privileged screen process via its unix socket in order to force
it to send SIGHUP to a PID that can be freely specified in the
query packet.
Processes that do not explicitly handle SIGHUP will simply terminate.

Signed-off-by: Alexander Naumov <alexander_naumov@opensuse.org>

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