staging: gdm724x: remove unneeded TO_HOST_SUCCESS enum

0 is always success in the kernel, just use that.

Cc: Won Kang <wonkang@gctsemi.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/gdm724x/gdm_tty.c

@@ -155,7 +155,7 @@ static int gdm_tty_recv_complete(void *data, int len, int index, int minor, int
 	if (complete == RECV_PACKET_PROCESS_COMPLETE)
 		gdm_tty_recv(tty_str, gdm_tty_recv_complete);
 
-	return TO_HOST_SUCCESS;
+	return 0;
 }
 
 static void gdm_tty_send_complete(void *arg)

drivers/staging/gdm724x/gdm_tty.h

@@ -24,7 +24,6 @@
 #define MAX_ISSUE_NUM 3
 
 enum TO_HOST_RESULT {
-	TO_HOST_SUCCESS = 0,
 	TO_HOST_BUFFER_REQUEST_FAIL = 1,
 	TO_HOST_PORT_CLOSE = 2,
 	TO_HOST_INVALID_PACKET = 3,