Fix a bug in the port stats check test suite that was causing
the DTS doc generation to fail.

Fixes: 8f21210b1d50 ("dts: add port stats check test suite")

Signed-off-by: Dean Marx <dmarx@iol.unh.edu>
---
 dts/tests/TestSuite_port_stats_checks.py | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/dts/tests/TestSuite_port_stats_checks.py b/dts/tests/TestSuite_port_stats_checks.py
index 2a3fb06946..491c2263b6 100644
--- a/dts/tests/TestSuite_port_stats_checks.py
+++ b/dts/tests/TestSuite_port_stats_checks.py
@@ -51,10 +51,15 @@ class TestPortStatsChecks(TestSuite):

     #: Length of the packet being sent including the IP and frame headers.
     total_packet_len: ClassVar[int] = 100
-    #: Packet to send during testing.
-    send_pkt: ClassVar[Packet] = (
-        Ether() / IP() / Raw(b"X" * (total_packet_len - ip_header_len - ether_header_len))
-    )
+
+    @property
+    def send_pkt(self) -> Packet:
+        """Packet to send during testing."""
+        return (
+            Ether()
+            / IP()
+            / Raw(b"X" * (self.total_packet_len - self.ip_header_len - self.ether_header_len))
+        )

     def extract_noise_information(
         self, verbose_out: list[TestPmdVerbosePacket]
--
2.49.0