staging: vchiq_core: introduce poll_services_of_group

The function poll_services() has too many indention levels. So keep only
the group iteration loop and move the rest into a new function
poll_services_of_group().

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Link: https://lore.kernel.org/r/1621105859-30215-7-git-send-email-stefan.wahren@i2se.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>