fix part of coverity scan problem

src/tsdb/src/tsdbFile.c

@@ -132,7 +132,7 @@ int tsdbOpenFileH(STsdbRepo *pRepo) {
         char *fname = malloc(strlen(tDataDir) + strlen(dp->d_name) + 2);
         if (fname == NULL) goto _err;
         sprintf(fname, "%s/%s", tDataDir, dp->d_name);
-        remove(fname);
+        (void)remove(fname);
         free(fname);
       } else if (code == REG_NOMATCH) {
         tsdbError("vgId:%d invalid file %s exists, ignore it", REPO_ID(pRepo), dp->d_name);
@@ -447,6 +447,8 @@ void tsdbGetFileInfoImpl(char *fname, uint32_t *magic, int32_t *size) {
   *magic = info.magic;
   *size = (int32_t)offset;
 
+  return;
+
 _err:
   if (fd >= 0) close(fd);
   *magic = TSDB_FILE_INIT_MAGIC;

src/tsdb/src/tsdbMemTable.c

@@ -683,11 +683,11 @@ static int tsdbCommitToFile(STsdbRepo *pRepo, int fid, SCommitIter *iters, SRWHe
 
   pthread_rwlock_wrlock(&(pFileH->fhlock));
 
-  rename(helperNewHeadF(pHelper)->fname, helperHeadF(pHelper)->fname);
+  (void)rename(helperNewHeadF(pHelper)->fname, helperHeadF(pHelper)->fname);
   pGroup->files[TSDB_FILE_TYPE_HEAD].info = helperNewHeadF(pHelper)->info;
 
   if (newLast) {
-    rename(helperNewLastF(pHelper)->fname, helperLastF(pHelper)->fname);
+    (void)rename(helperNewLastF(pHelper)->fname, helperLastF(pHelper)->fname);
     pGroup->files[TSDB_FILE_TYPE_LAST].info = helperNewLastF(pHelper)->info;
   } else {
     pGroup->files[TSDB_FILE_TYPE_LAST].info = helperLastF(pHelper)->info;

src/util/src/tkvstore.c

@@ -351,6 +351,8 @@ void tsdbGetStoreInfo(char *fname, uint32_t *magic, int32_t *size) {
   *magic = info.magic;
   *size = (int32_t)offset;
 
+  return;
+
 _err:
   if (fd >= 0) close(fd);
   *magic = TD_KVSTORE_INIT_MAGIC;