tcp: tcp_time_to_recover() cleanup

tcp_time_to_recover() does not need the @flag argument.

Its first parameter can be marked const, and of tcp_sock type.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20250618091246.1260322-1-edumazet@google.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>