Switch s to ssl everywhere.

That we're half and half is really confusing.

Change-Id: I1c2632682e8a3e63d01dada8e0eb3b735ff709ce
Reviewed-on: https://boringssl-review.googlesource.com/6785
Reviewed-by: Adam Langley <agl@google.com>
diff --git a/ssl/ssl_session.c b/ssl/ssl_session.c
index 0dcfdd8..3d59bc3 100644
--- a/ssl/ssl_session.c
+++ b/ssl/ssl_session.c
@@ -645,10 +645,10 @@
   CRYPTO_MUTEX_unlock(&ctx->lock);
 }
 
-int ssl_clear_bad_session(SSL *s) {
-  if (s->session != NULL && !(s->shutdown & SSL_SENT_SHUTDOWN) &&
-      !SSL_in_init(s)) {
-    SSL_CTX_remove_session(s->ctx, s->session);
+int ssl_clear_bad_session(SSL *ssl) {
+  if (ssl->session != NULL && !(ssl->shutdown & SSL_SENT_SHUTDOWN) &&
+      !SSL_in_init(ssl)) {
+    SSL_CTX_remove_session(ssl->ctx, ssl->session);
     return 1;
   }