fix a possible coredump

src/tsdb/src/tsdbCommit.c

@@ -220,6 +220,8 @@ void tsdbGetRtnSnap(STsdbRepo *pRepo, SRtn *pRtn) {
   pRtn->minFid = (int)(TSDB_KEY_FID(minKey, pCfg->daysPerFile, pCfg->precision));
   pRtn->midFid = (int)(TSDB_KEY_FID(midKey, pCfg->daysPerFile, pCfg->precision));
   pRtn->maxFid = (int)(TSDB_KEY_FID(maxKey, pCfg->daysPerFile, pCfg->precision));
+  tsdbDebug("vgId:%d now:%" PRId64 " minKey:%" PRId64 " minFid:%d, midFid:%d, maxFid:%d", REPO_ID(pRepo), now, minKey,
+            pRtn->minFid, pRtn->midFid, pRtn->maxFid);
 }
 
 static int tsdbUpdateMetaRecord(STsdbFS *pfs, SMFile *pMFile, uint64_t uid, void *cont, int contLen) {

src/tsdb/src/tsdbFS.c

@@ -848,7 +848,7 @@ static int tsdbScanRootDir(STsdbRepo *pRepo) {
       continue;
     }
 
-    if (tfsIsSameFile(pf, &(pfs->cstatus->pmf->f))) {
+    if (pfs->cstatus->pmf && tfsIsSameFile(pf, &(pfs->cstatus->pmf->f))) {
       continue;
     }