sound: Fix Kconfig indentation

Adjust indentation from spaces to tab (+optional two spaces) as in
coding style with command like:
    $ sed -e 's/^        /\t/' -i */Kconfig

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Acked-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20191004144931.3851-1-krzk@kernel.org
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/usb/Kconfig b/sound/usb/Kconfig
index e2c53a0..059242f 100644
--- a/sound/usb/Kconfig
+++ b/sound/usb/Kconfig
@@ -107,24 +107,24 @@
 	  will be called snd-usb-us122l.
 
 config SND_USB_6FIRE
-        tristate "TerraTec DMX 6Fire USB"
-        select FW_LOADER
-        select BITREVERSE
-        select SND_RAWMIDI
-        select SND_PCM
-        select SND_VMASTER
-        help
-          Say Y here to include support for TerraTec 6fire DMX USB interface.
+	tristate "TerraTec DMX 6Fire USB"
+	select FW_LOADER
+	select BITREVERSE
+	select SND_RAWMIDI
+	select SND_PCM
+	select SND_VMASTER
+	help
+	  Say Y here to include support for TerraTec 6fire DMX USB interface.
 
-          You will need firmware files in order to be able to use the device
-          after it has been coldstarted. An install script for the firmware
-          and further help can be found at
-          http://sixfireusb.sourceforge.net
+	  You will need firmware files in order to be able to use the device
+	  after it has been coldstarted. An install script for the firmware
+	  and further help can be found at
+	  http://sixfireusb.sourceforge.net
 
 config SND_USB_HIFACE
-        tristate "M2Tech hiFace USB-SPDIF driver"
-        select SND_PCM
-        help
+	tristate "M2Tech hiFace USB-SPDIF driver"
+	select SND_PCM
+	help
 	  Select this option to include support for M2Tech hiFace USB-SPDIF
 	  interface.