solve some static check questions for shell/src/

src/kit/shell/src/shellEngine.c

@@ -780,6 +780,7 @@ void source_file(TAOS *con, char *fptr) {
 
   if (wordexp(fptr, &full_path, 0) != 0) {
     fprintf(stderr, "ERROR: illegal file name\n");
+    free(cmd);
     return;
   }
 
@@ -788,6 +789,7 @@ void source_file(TAOS *con, char *fptr) {
   if (access(fname, R_OK) == -1) {
     fprintf(stderr, "ERROR: file %s is not readable\n", fptr);
     wordfree(&full_path);
+    free(cmd);
     return;
   }
 
@@ -795,6 +797,7 @@ void source_file(TAOS *con, char *fptr) {
   if (f == NULL) {
     fprintf(stderr, "ERROR: failed to open file %s\n", fname);
     wordfree(&full_path);
+    free(cmd);
     return;
   }
 

src/kit/shell/src/shellLinux.c

@@ -277,7 +277,10 @@ void *shellLoopQuery(void *arg) {
   pthread_cleanup_push(cleanup_handler, NULL);
 
   char *command = malloc(MAX_COMMAND_SIZE);
-
+  if (command == NULL){
+    tscError("failed to malloc command");
+    return NULL;
+  }
   while (1) {
     // Read command from shell.
 
@@ -286,10 +289,8 @@ void *shellLoopQuery(void *arg) {
     shellReadCommand(con, command);
     reset_terminal_mode();
 
-    if (command != NULL) {
-      // Run the command
-      shellRunCommand(con, command);
-    }
+    // Run the command
+    shellRunCommand(con, command);
   }
 
   pthread_cleanup_pop(1);