Sentinel tls memory leak (#9753)

There was a memory leak when tls is used in Sentinels.
The memory leak is noticed when some of the replicas are offline.

src/sentinel.c

@@ -2348,7 +2348,10 @@ static int instanceLinkNegotiateTLS(redisAsyncContext *context) {
     SSL *ssl = SSL_new(redis_tls_client_ctx ? redis_tls_client_ctx : redis_tls_ctx);
     if (!ssl) return C_ERR;
 
-    if (redisInitiateSSL(&context->c, ssl) == REDIS_ERR) return C_ERR;
+    if (redisInitiateSSL(&context->c, ssl) == REDIS_ERR) {
+        SSL_free(ssl);
+        return C_ERR;
+    }
 #endif
     return C_OK;
 }