fix: crash if libfuse is not available at runtime

changelog.md

@@ -5,6 +5,7 @@
 ### Fixes
 
 *   Fix meson build failure when gtest or jansson are not installed
+*   Fix crash if libfuse is not available at runtime
 
 ## 0.3.0 _(Fri Jun 05 2020)_
 

lib/webfuse/adapter/impl/session.c

@@ -109,8 +109,11 @@ bool wf_impl_session_add_filesystem(
     if (result)
     {
         struct wf_impl_filesystem * filesystem = wf_impl_filesystem_create(session, name, mountpoint);
-        wf_slist_append(&session->filesystems, &filesystem->item);
         result = (NULL != filesystem);
+        if (result)
+        {
+            wf_slist_append(&session->filesystems, &filesystem->item);
+        }
     }
     
     // cleanup on error