Correct code style

Signed-off-by: Ben Taylor <ben.taylor@linaro.org>
diff --git a/library/ssl_tls.c b/library/ssl_tls.c
index 3b62df4..2a75983 100644
--- a/library/ssl_tls.c
+++ b/library/ssl_tls.c
@@ -4464,11 +4464,13 @@
 
 #if defined(MBEDTLS_SSL_ASYNC_PRIVATE)
     if (ssl->conf != NULL) {
-    if (ssl->conf->f_async_cancel != NULL) {
-    if(handshake->async_in_progress != 0) {
-        ssl->conf->f_async_cancel(ssl);
-        handshake->async_in_progress = 0;
-    }}}
+        if (ssl->conf->f_async_cancel != NULL) {
+            if (handshake->async_in_progress != 0) {
+                ssl->conf->f_async_cancel(ssl);
+                handshake->async_in_progress = 0;
+            }
+        }
+    }
 
 #endif /* MBEDTLS_SSL_ASYNC_PRIVATE */