relay: fixup kerneldoc comment

Change comment from kerneldoc to normal.

Signed-off-by: Tom Zanussi <zanussi@us.ibm.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/kernel/relay.c b/kernel/relay.c
index 7802697..a615a8f 100644
--- a/kernel/relay.c
+++ b/kernel/relay.c
@@ -1061,7 +1061,7 @@
 	.get = generic_pipe_buf_get,
 };
 
-/**
+/*
  *	subbuf_splice_actor - splice up to one subbuf's worth of data
  */
 static int subbuf_splice_actor(struct file *in,