lfs: guard null callbacks in lfs_dir_fetchmatch
@@ -1291,6 +1291,7 @@ static lfs_stag_t lfs_dir_fetchmatch(lfs_t *lfs,
// found a match for our fetcher?
if ((fmask & tag) == (fmask & ftag)) {
LFS_ASSERT(cb != NULL);
int res = cb(data, tag, &(struct lfs_diskoff){
dir->pair[0], off+sizeof(tag)});
if (res < 0) {
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