Extract tcp_header without "if let"
Extract tcp_header without "if let"

This avoids one level of indentation everywhere.

WPO-Foundation/gnirehtet,WPO-Foundation/gnirehtet,Genymobile/gnirehtet,WPO-Foundation/gnirehtet,WPO-Foundation/gnirehtet,Genymobile/gnirehtet,Genymobile/gnirehtet