Kernel: Avoid allocations when handling network packets

Author: https://github.com/gunnarbeutner
Commit: 006f11f23d
Pull-request: https://github.com/SerenityOS/serenity/pull/7151
Reviewed-by: https://github.com/alimpfard

Kernel/Net/TCPSocket.h

@@ -194,7 +194,7 @@ private:
 
     struct OutgoingPacket {
         u32 ack_number { 0 };
-        ByteBuffer buffer;
+        NetworkByteBuffer buffer;
         int tx_counter { 0 };
     };