Staging: wlan-ng: fix brace coding style issue in prism2fw.c

This is a patch to the prism2fw.c file that fixes up a brace
warning found by the checkpatch.pl tool.

Signed-off-by: Joseph Salisbury <salisbury.joseph@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>