staging: rtl8192e: Remove unused variable PwrDomainProtect

PwrDomainProtect is initialized and then never evaluated. Remove resulting
dead code.

Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/769f4d3337872d29d8fc5e31613aac52b6bae95b.1674071236.git.philipp.g.hortmann@gmail.com


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