pollfd array used with zsock_poll() should not be modified while inside
zsock_poll() function as this could lead to unexpected results. For
instance, k_poll already monitoring some kernel primitive could report
an event, but it will not be processed if the monitored socket file
descriptor in the pollfd array was set to -1. In result,
zsock_poll() may unexpectedly quit prematurely, returning 0 events, even
if it was requested to wait infinitely.
The pollfd arrays used by zsock_poll() (ctx.events) is reinitialized
when the service thread is restarted so modifying it directly when
registering/unregistering service is not really needed. It's enough if
those functions notify the eventfd socket used to restart the services
thread.
Signed-off-by: Robert Lubos <robert.lubos@nordicsemi.no>
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