staging: brcm80211: fix checkpatch warnings in si_pmu_spuravoid_pllupdate

patch "remove dependency between aiutils and siutils sources" resulted
in several checkpatch warnings and errors. This patch fixes those in
function si_pmu_spuravoid_pllupdate().

Cc: devel@linuxdriverproject.org
Cc: linux-wireless@vger.kernel.org
Cc: Brett Rudley <brudley@broadcom.com>
Cc: Henry Ptasinski <henryp@broadcom.com>
Cc: Roland Vossen <rvossen@broadcom.com>
Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>