Staging: wlan-ng: fix coding style issues in prism2mgmt.c

This is a patch to prism2mgmt.c that fixes coding style issues found by
checkpatch.pl. Three instances of the 80 char line limit being exceeded
have been kept as is so that string literals are not split up.

Signed-off-by: Johan Meiring <johanmeiring@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>