make develop branch same as coverity-scan.

src/os/linux/src/linuxSysPara.c

@@ -160,7 +160,7 @@ static void taosGetSystemTimezone() {
 
   /* load time zone string from /etc/timezone */
   FILE *f = fopen("/etc/timezone", "r");
-  char  buf[65] = {0};
+  char  buf[68] = {0};
   if (f != NULL) {
     int len = fread(buf, 64, 1, f);
     if(len < 64 && ferror(f)) {
@@ -170,18 +170,17 @@ static void taosGetSystemTimezone() {
     }
     
     fclose(f);
-  }
 
-  char *lineEnd = strstr(buf, "\n");
-  if (lineEnd != NULL) {
-    *lineEnd = 0;
-  }
+    char *lineEnd = strstr(buf, "\n");
+    if (lineEnd != NULL) {
+      *lineEnd = 0;
+    }
 
-  // for CentOS system, /etc/timezone does not exist. Ignore the TZ environment variables
-  if (strlen(buf) > 0) {
-    setenv("TZ", buf, 1);
+    // for CentOS system, /etc/timezone does not exist. Ignore the TZ environment variables
+    if (strlen(buf) > 0) {
+      setenv("TZ", buf, 1);
+    }
   }
-
   // get and set default timezone
   tzset();