[PATCH] wireless: More WE-21 potential overflows...

After the Orinoco issue, I did an audit of other drivers for the same
issue.  Three drivers were NULL terminating the ESSID, which could cause an
overflow in WE-21 when the ESSID has maximum size.

Signed-off-by: Jean Tourrilhes <jt@hpl.hp.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>