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dvb_usb_device_init stores parts of properties at d->props
and d->desc and uses it on dvb_usb_device_exit.
Free of properties on module probe leads to use after free.
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=204597

The patch makes properties static instead of allocated on heap to prevent
memleak and use after free.
Also fixes s421_properties.devices initialization to have 2 element
instead of 6 copied from p7500_properties.

[mchehab: fix function call alignments]
Link: https://lore.kernel.org/linux-media/20190822104147.4420-1-vasilyev@ispras.ru

Signed-off-by: Anton Vasilyev <vasilyev@ispras.ru>
Fixes: 299c7007

 ("media: dw2102: Fix memleak on sequence of probes")
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>