Fix a few double ;

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/1618)
diff --git a/apps/s_client.c b/apps/s_client.c
index 5307eab..d2f10a6 100644
--- a/apps/s_client.c
+++ b/apps/s_client.c
@@ -2365,7 +2365,7 @@
                 /* goto end; */
             }
 
-            sbuf_len -= i;;
+            sbuf_len -= i;
             sbuf_off += i;
             if (sbuf_len <= 0) {
                 read_ssl = 1;