Error message to stderr

src/osdi/osdiregistry.c

@@ -256,7 +256,7 @@ extern OsdiObjectFile load_object_file(const char *input) {
   }
   const char *path = resolve_input_path(input);
   if (!path) {
-    printf("Error opening osdi lib \"%s\": No such file or directory!\n",
+    fprintf(stderr, "Error opening osdi lib \"%s\": No such file or directory!\n",
            input);
     return INVALID_OBJECT;
   }