Fix missing break in switch for SSL presets

closes #235
diff --git a/library/ssl_tls.c b/library/ssl_tls.c
index 4938964..9007562 100644
--- a/library/ssl_tls.c
+++ b/library/ssl_tls.c
@@ -6836,6 +6836,7 @@
 #if defined(MBEDTLS_ECP_C)
             conf->curve_list = ssl_preset_suiteb_curves;
 #endif
+            break;
 
         /*
          * Default