Staging: rtl8187se: fix build warnings

drivers/staging/rtl8187se/r8180_wx.c:1386: warning: initialization from incompatible pointer type
drivers/staging/rtl8187se/r8180_wx.c:1388: warning: initialization from incompatible pointer type

Signed-off-by: Herton Ronaldo Krzesinski <herton@mandriva.com.br>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>