hselasky 62b5298648 Fix implementation of task_pid_group_leader() in the LinuxKPI.
In FreeBSD thread IDs and procedure IDs have distinct number
spaces. When asking for the group leader task ID in the LinuxKPI,
return the procedure ID and let this resolve to the first task in the
procedure having a valid LinuxKPI task structure pointer.

MFC after:		1 week
Sponsored by:		Mellanox Technologies
2017-04-06 10:26:03 +00:00
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