ipv4: Use inet_sk_init_flowi4() in inet_csk_rebuild_route().

Use inet_sk_init_flowi4() to automatically initialise the flowi4
structure in inet_csk_rebuild_route() instead of passing parameters
manually to ip_route_output_ports().

Signed-off-by: Guillaume Nault <gnault@redhat.com>
Link: https://patch.msgid.link/b270931636effa1095508e0f0a3e8c3a0e6d357f.1734357769.git.gnault@redhat.com


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