tspp: Protect against buffer overflow

Change filter->priority to unsigned int. Since it was defined as integer,
it may have had negative value and cause accessing an array outside
of its region

Signed-off-by: Hamad Kadmany <hkadmany@codeaurora.org>
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
Signed-off-by: Chet Kener <Cl3Kener@gmail.com>