Staging: silicom: move more assignments out of if conditions

Remove more assignments from if-statement conditions in bpctl_mod.c,
resolving checkpatch.pl errors. Those that remain need more attention
than I'm presently prepared to give them.

Signed-off-by: Chad Williamson <chad@dahc.us>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>