kern/50672: urtwn: fix a typo in urtwn_chip_stop()

[avos%FreeBSD.org@localhost]

>Number:         50672
>Category:       kern
>Synopsis:       urtwn: fix a typo in urtwn_chip_stop()
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Jan 17 21:35:00 +0000 2016
>Originator:     Andriy Voskoboinyk
>Release:        
>Organization:
>Environment:
>Description:
There is a (probably, copy-paste) typo:

static void
urtwn_chip_stop(struct urtwn_softc *sc)
{
...
	urtwn_write_4(sc, R92C_GPIO_PIN_CTRL, reg);

	/* Disable GPIO[10:8] */
	urtwn_write_1(sc, R92C_GPIO_MUXCFG + 3, 0x00);

	reg = urtwn_read_2(sc, R92C_GPIO_MUXCFG + 2) & ~0x00f0;
	reg |= (((reg & 0x000f) << 4) | 0x0780);
	urtwn_write_2(sc, R92C_GPIO_PIN_CTRL+2, reg);  << wrong register is used here (0x044+2 instead of 0x040+2)
...
}

Vendor's driver implementation:

static VOID
_DisableGPIO(
...
        //2. Disable GPIO[10:8]
        rtw_write8(Adapter, REG_GPIO_MUXCFG+3, 0x00);
            value16 = rtw_read16(Adapter, REG_GPIO_MUXCFG+2) & 0xFF0F;
        value8 = (u8) (value16&0x000F);
        value16 |= ((value8<<4) | 0x0780);
        rtw_write16(Adapter, REG_GPIO_MUXCFG+2, value16);
...
}
>How-To-Repeat:

>Fix:
Replace R92C_GPIO_PIN_CTRL+2 in the last copied line with R92C_GPIO_MUXCFG + 2 (or with R92C_GPIO_IO_SEL)