Staging: bcm: Bcmchar.c: Renamed variable "IoBuffer" -> "io_buff"

Renamed variable "IoBuffer" -> "io_buff" in

    bcm_char_ioctl_reg_read_private()
    bcm_char_ioctl_reg_write_private()
    bcm_char_ioctl_reg_write_private()
    bcm_char_ioctl_eeprom_reg_read()
    bcm_char_ioctl_gpio_set_request()

Signed-off-by: Matthias Beyer <mail@beyermatthias.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>