[CP] fix file read error

src/observer/main.cpp

@@ -408,14 +408,13 @@ static void print_all_thread(const char* desc)
     struct dirent *entry;
     while ((entry = readdir(dir)) != NULL) {
       char *tid = entry->d_name;
-      if (tid[0] == '.')
-        continue;  // pass . and ..
+      if (tid[0] != '.') { // pass . and ..
         char path[256];
         sprintf(path, "/proc/self/task/%s/comm", tid);
         FILE *file = fopen(path, "r");
         if (file == NULL) {
           MPRINT("fail to print thread tid: %s", tid);
-      }
+        } else {
           char name[256];
           fgets(name, 256, file);
           size_t len = strlen(name);
@@ -426,6 +425,8 @@ static void print_all_thread(const char* desc)
           fclose(file);
         }
       }
+    }
+  }
   closedir(dir);
   MPRINT("============= [%s] finish to show unstopped thread =============", desc);
 }