fix: fix error checking pthread_join return value bug

On success, pthread_join() returns 0; on error, it returns an error
number(EDEADLK/EINVAL/EINVAL/ESRCH) which is a positive integer.
Signed-off-by: Nwujing <wujing50@huawei.com>

src/daemon/modules/container/health_check/health_check.c

@@ -634,7 +634,7 @@ static int do_monitor_interval(const char *container_id, health_check_manager_t
         ret = -1;
         goto out;
     }
-    if (pthread_join(exec_tid, NULL) < 0) {
+    if (pthread_join(exec_tid, NULL) != 0) {
         ERROR("Failed to run health check thread");
         ret = -1;
         goto out;

src/daemon/modules/service/service_container.c

@@ -1707,7 +1707,7 @@ static void exec_container_end(container_exec_response *response, uint32_t cc, i
         }
     }
     if (thread_id > 0) {
-        if (pthread_join(thread_id, NULL) < 0) {
+        if (pthread_join(thread_id, NULL) != 0) {
             ERROR("Failed to join thread: %u", (unsigned int)thread_id);
         }
     }
@@ -1860,4 +1860,4 @@ pack_response:
     free_defs_process_user(puser);
 
     return (cc == ISULAD_SUCCESS) ? 0 : -1;
-}
\ No newline at end of file
+}