Merge pull request #9440 from sezrab/mbedtls_test_ssl_message_queue_pop_info-2.28

[Backport 2.28] tests/ssl_helpers: Check that message queue is popped
diff --git a/tests/src/test_helpers/ssl_helpers.c b/tests/src/test_helpers/ssl_helpers.c
index f919db0..9afc633 100644
--- a/tests/src/test_helpers/ssl_helpers.c
+++ b/tests/src/test_helpers/ssl_helpers.c
@@ -503,7 +503,10 @@
              * happen in test environment, unless forced manually. */
         }
     }
-    mbedtls_test_ssl_message_queue_pop_info(queue, buf_len);
+    ret = mbedtls_test_ssl_message_queue_pop_info(queue, buf_len);
+    if (ret < 0) {
+        return ret;
+    }
 
     return (msg_len > INT_MAX) ? INT_MAX : (int) msg_len;
 }