staging: rtl8712: correct spelling mistake in comment

Correct a spelling mistake discovered by checkpatch.
attatch -> attach

Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20200413215109.15749-1-straube.linux@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8712/usb_halinit.c

@@ -58,7 +58,7 @@ u8 r8712_usb_hal_bus_init(struct _adapter *adapter)
 		r8712_write8(adapter, SYS_ISO_CTRL + 1, val8);
 		val8 = r8712_read8(adapter, SYS_ISO_CTRL + 1);
 		val8 = val8 & 0xEF;
-		/* attatch AFE PLL to MACTOP/BB/PCIe Digital */
+		/* attach AFE PLL to MACTOP/BB/PCIe Digital */
 		r8712_write8(adapter, SYS_ISO_CTRL + 1, val8);
 		val8 = r8712_read8(adapter, AFE_XTAL_CTRL + 1);
 		val8 = val8 & 0xFB;