mlx4_en: remove sparse errors
mlx4_en: remove sparse errors

Fix new sparse errors introduced in commit 6221217199 (mlx4_en: dont
change mac_header on xmit)

Reported-by: Or Gerlitz <22a315910f6b1a356dcb761d515115d40922d94f@gmail.com>
Signed-off-by: Eric Dumazet <a0baddf32b28d2f9429941ed4af2fe636e210591@gmail.com>
Cc: Yevgeny Petrilin <251a488925e7cd0620cce51219b21e7ea034f462@mellanox.co.il>
Signed-off-by: David S. Miller <fe08d3c717adf2ae63592e4c9aec6e3e404d8e3e@davemloft.net>

KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs