staging: line6: drop ToneportSourceInfo CamelCase name

Fix the following checkpatch.pl warning:

  WARNING: Avoid CamelCase: <ToneportSourceInfo>
  #5383: FILE: staging/line6/toneport.c:90:
  +struct ToneportSourceInfo {

Since the struct is only used to define the global
toneport_source_info[] table, I have chosen to make the struct
anonymous and part of the table definition.
Signed-off-by: NStefan Hajnoczi <stefanha@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/line6/toneport.c

@@ -87,12 +87,10 @@ static struct line6_pcm_properties toneport_pcm_properties = {
 static int led_red = 0x00;
 static int led_green = 0x26;
 
-struct ToneportSourceInfo {
+static const struct {
 	const char *name;
 	int code;
-};
-
-static const struct ToneportSourceInfo toneport_source_info[] = {
+} toneport_source_info[] = {
 	{"Microphone", 0x0a01},
 	{"Line", 0x0801},
 	{"Instrument", 0x0b01},