enic: fix incorrect MTU comparison in enic_change_mtu()

[ Upstream commit aaf2b2480375099c022a82023e1cd772bf1c6a5d ]

The comparison in enic_change_mtu() incorrectly used the current
netdev->mtu instead of the new new_mtu value when warning about
an MTU exceeding the port MTU. This could suppress valid warnings
or issue incorrect ones.

Fix the condition and log to properly reflect the new_mtu.

Fixes: ab123fe0 ("enic: handle mtu change for vf properly")
Signed-off-by: Alok Tiwari <alok.a.tiwari@oracle.com>
Acked-by: John Daley <johndale@cisco.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20250628145612.476096-1-alok.a.tiwari@oracle.com


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