added a NULL check in `UnloadDirectoryFiles`

src/rcore.c

@@ -2314,9 +2314,12 @@ FilePathList LoadDirectoryFilesEx(const char *basePath, const char *filter, bool
 // WARNING: files.count is not reseted to 0 after unloading
 void UnloadDirectoryFiles(FilePathList files)
 {
-    for (unsigned int i = 0; i < files.capacity; i++) RL_FREE(files.paths[i]);
+    if (files.paths != NULL)
+    {
+        for (unsigned int i = 0; i < files.capacity; i++) RL_FREE(files.paths[i]);
 
-    RL_FREE(files.paths);
+        RL_FREE(files.paths);
+    }
 }
 
 // Create directories (including full path requested), returns 0 on success