staging: correct dubious use of !x & y

Noticed by sparse:
drivers/staging/me4000/me4000.c:1213:43: warning: dubious: !x & y
drivers/staging/wlan-ng/p80211wext.c:1583:21: warning: dubious: !x & y

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>