Hotfix/sangshuduo/td 3197 taosdemo coverity scan for master (#7375)

* [TD-3197]<fix>: taosdemo and taosdump coverity scan issues.

* exit if read sample file failed.

* fix converity scan issue.

* fix coverity scan issue.

* fix coverity scan memory leak.

* fix resource leak reported by coverity scan.

* fix taosdemo coverity scan issue.
Co-authored-by: NShuduo Sang <sdsang@taosdata.com>

src/kit/taosdemo/taosdemo.c

@@ -5820,6 +5820,7 @@ static int32_t prepareStmtBindArrayByType(
     } else if (0 == strncasecmp(dataType,
                 "INT", strlen("INT"))) {
         int32_t *bind_int = malloc(sizeof(int32_t));
+        assert(bind_int);
 
         if (value) {
             *bind_int = atoi(value);
@@ -5834,6 +5835,7 @@ static int32_t prepareStmtBindArrayByType(
     } else if (0 == strncasecmp(dataType,
                 "BIGINT", strlen("BIGINT"))) {
         int64_t *bind_bigint = malloc(sizeof(int64_t));
+        assert(bind_bigint);
 
         if (value) {
             *bind_bigint = atoll(value);
@@ -5848,6 +5850,7 @@ static int32_t prepareStmtBindArrayByType(
     }  else if (0 == strncasecmp(dataType,
                 "FLOAT", strlen("FLOAT"))) {
         float *bind_float = malloc(sizeof(float));
+        assert(bind_float);
 
         if (value) {
             *bind_float = (float)atof(value);
@@ -5862,6 +5865,7 @@ static int32_t prepareStmtBindArrayByType(
     }  else if (0 == strncasecmp(dataType,
                 "DOUBLE", strlen("DOUBLE"))) {
         double *bind_double = malloc(sizeof(double));
+        assert(bind_double);
 
         if (value) {
             *bind_double = atof(value);
@@ -5876,6 +5880,7 @@ static int32_t prepareStmtBindArrayByType(
     }  else if (0 == strncasecmp(dataType,
                 "SMALLINT", strlen("SMALLINT"))) {
         int16_t *bind_smallint = malloc(sizeof(int16_t));
+        assert(bind_smallint);
 
         if (value) {
             *bind_smallint = (int16_t)atoi(value);
@@ -5890,6 +5895,7 @@ static int32_t prepareStmtBindArrayByType(
     }  else if (0 == strncasecmp(dataType,
                 "TINYINT", strlen("TINYINT"))) {
         int8_t *bind_tinyint = malloc(sizeof(int8_t));
+        assert(bind_tinyint);
 
         if (value) {
             *bind_tinyint = (int8_t)atoi(value);
@@ -5904,6 +5910,7 @@ static int32_t prepareStmtBindArrayByType(
     }  else if (0 == strncasecmp(dataType,
                 "BOOL", strlen("BOOL"))) {
         int8_t *bind_bool = malloc(sizeof(int8_t));
+        assert(bind_bool);
 
         if (value) {
             if (strncasecmp(value, "true", 4)) {
@@ -5923,6 +5930,7 @@ static int32_t prepareStmtBindArrayByType(
     }  else if (0 == strncasecmp(dataType,
                 "TIMESTAMP", strlen("TIMESTAMP"))) {
         int64_t *bind_ts2 = malloc(sizeof(int64_t));
+        assert(bind_ts2);
 
         if (value) {
             if (strchr(value, ':') && strchr(value, '-')) {
@@ -5937,6 +5945,7 @@ static int32_t prepareStmtBindArrayByType(
                 if (TSDB_CODE_SUCCESS != taosParseTime(
                             value, &tmpEpoch, strlen(value),
                             timePrec, 0)) {
+                    free(bind_ts2);
                     errorPrint("Input %s, time format error!\n", value);
                     return -1;
                 }
@@ -6261,7 +6270,7 @@ static int32_t prepareStbStmtBindTag(
     char *bindBuffer = calloc(1, DOUBLE_BUFF_LEN); // g_args.len_of_binary);
     if (bindBuffer == NULL) {
         errorPrint("%s() LN%d, Failed to allocate %d bind buffer\n",
-                __func__, __LINE__, g_args.len_of_binary);
+                __func__, __LINE__, DOUBLE_BUFF_LEN);
         return -1;
     }
 
@@ -6293,7 +6302,7 @@ static int32_t prepareStbStmtBindRand(
     char *bindBuffer = calloc(1, DOUBLE_BUFF_LEN); // g_args.len_of_binary);
     if (bindBuffer == NULL) {
         errorPrint("%s() LN%d, Failed to allocate %d bind buffer\n",
-                __func__, __LINE__, g_args.len_of_binary);
+                __func__, __LINE__, DOUBLE_BUFF_LEN);
         return -1;
     }