staging: vt6655: fix sparse warnings: incorrect argument type

this patch fixes following sparse warnings:

drivers/staging/vt6655/device_main.c:1503:25: warning: incorrect type in argument 1 (different address spaces)
drivers/staging/vt6655/device_main.c:1503:25:    expected void [noderef] <asn:2>*<noident>
drivers/staging/vt6655/device_main.c:1503:25:    got struct vnt_private *
drivers/staging/vt6655/device_main.c:1503:25: warning: incorrect type in argument 2 (different address spaces)
drivers/staging/vt6655/device_main.c:1503:25:    expected void [noderef] <asn:2>*<noident>
drivers/staging/vt6655/device_main.c:1503:25:    got struct vnt_private *
drivers/staging/vt6655/device_main.c:1505:25: warning: incorrect type in argument 1 (different address spaces)
drivers/staging/vt6655/device_main.c:1505:25:    expected void [noderef] <asn:2>*<noident>
drivers/staging/vt6655/device_main.c:1505:25:    got struct vnt_private *
drivers/staging/vt6655/device_main.c:1505:25: warning: incorrect type in argument 2 (different address spaces)
drivers/staging/vt6655/device_main.c:1505:25:    expected void [noderef] <asn:2>*<noident>
drivers/staging/vt6655/device_main.c:1505:25:    got struct vnt_private *

Signed-off-by: Mike Krinkin <krinkin.m.u@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>