fix: coverity scan for sma and tfs

source/dnode/vnode/src/sma/smaSnapshot.c

@@ -376,7 +376,7 @@ int32_t rsmaSnapWriterClose(SRSmaSnapWriter** ppWriter, int8_t rollback) {
       if (taosRemoveFile(pWriter->pQTaskFWriter->fname) != 0) {
         smaWarn("vgId:%d, vnode snapshot rsma writer failed to remove %s since %s", SMA_VID(pWriter->pSma),
                 pWriter->pQTaskFWriter->fname ? pWriter->pQTaskFWriter->fname : "NULL",
-                terrstr(TAOS_SYSTEM_ERROR(errno)));
+                tstrerror(TAOS_SYSTEM_ERROR(errno)));
       }
     }
   } else {

source/libs/tfs/src/tfs.c

@@ -354,7 +354,7 @@ const STfsFile *tfsReaddir(STfsDir *pTfsDir) {
       char *name = taosGetDirEntryName(pDirEntry);
       if (strcmp(name, ".") == 0 || strcmp(name, "..") == 0) continue;
 
-      if (pTfsDir->dirName == NULL || pTfsDir->dirName[0] == 0) {
+      if (pTfsDir->dirName[0] == 0) {
         snprintf(bname, TMPNAME_LEN * 2, "%s", name);
       } else {
         snprintf(bname, TMPNAME_LEN * 2, "%s%s%s", pTfsDir->dirName, TD_DIRSEP, name);