[td-98] fix uninitialized value access warning by valgrind.

src/kit/shell/src/shellEngine.c

@@ -284,7 +284,7 @@ void shellRunCommandOnServer(TAOS *con, char command[]) {
 /* Function to do regular expression check */
 int regex_match(const char *s, const char *reg, int cflags) {
   regex_t regex;
-  char    msgbuf[100];
+  char    msgbuf[100] = {0};
 
   /* Compile regular expression */
   if (regcomp(&regex, reg, cflags) != 0) {

src/kit/shell/src/shellMain.c

@@ -97,6 +97,8 @@ int main(int argc, char* argv[]) {
 
   /* Interupt handler. */
   struct sigaction act;
+  memset(&act, 0, sizeof(struct sigaction));
+  
   act.sa_handler = interruptHandler;
   sigaction(SIGTERM, &act, NULL);
   sigaction(SIGINT, &act, NULL);