FreeBSD/src 4d680e6 (r352477)sys/compat/linuxkpi/common/src linux_work.c

MFC r352206:
Fix synchronous work drain issue in the LinuxKPI.

A work callback may restart itself. Loop in the drain function to see if the
work has been rescheduled and stop the subsequent reschedules, if any.

Sponsored by:           Mellanox Technologies
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+15-10sys/compat/linuxkpi/common/src/linux_work.c
+15-101 files

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