CLEANUP: fix all duplicated semicolons

trivial commit, does not change the code behaviour

Signed-off-by: William Dauchy <w.dauchy@criteo.com>
diff --git a/src/ring.c b/src/ring.c
index 7c7d58e..2ee6c10 100644
--- a/src/ring.c
+++ b/src/ring.c
@@ -186,7 +186,7 @@
 		totlen += len;
 	}
 
-	*b_tail(buf) = 0; buf->data++;; // new read counter
+	*b_tail(buf) = 0; buf->data++; // new read counter
 	sent = lenlen + totlen + 1;
 
 	/* notify potential readers */