wakeonlan: coverage near 100% and check_mode++ (#26683)

This makes check_mode run more code (without sending out a packet.

And should get coverage to 98%.

lib/ansible/modules/remote_management/wakeonlan.py

@@ -102,17 +102,19 @@ def wakeonlan(module, mac, broadcast, port):
     for i in range(0, len(padding), 2):
         data = b''.join([data, struct.pack('B', int(padding[i: i + 2], 16))])
 
-    if not module.check_mode:
-
     # Broadcast payload to network
     sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
     sock.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
+
+    if not module.check_mode:
+
         try:
             sock.sendto(data, (broadcast, port))
         except socket.error:
             e = get_exception()
             sock.close()
             module.fail_json(msg=str(e))
+
     sock.close()