net: lan78xx: Bail out if lan78xx_get_endpoints fails

We need to bail out if lan78xx_get_endpoints() fails, otherwise the
result is overwritten.

Change-Id: If3e62a87653870e5174136d0e360cfa2b746b9cb
Fixes: 55d7de9d ("Microchip's LAN7800 family USB 2/3 to 10/100/1000 Ethernet")
Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Reviewed-by: Raghuram Chary Jallipalli <raghuramchary.jallipalli@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Git-commit: fa8cd98c06407b5798b927cd7fd14d30f360ed02
Git-repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git


Signed-off-by: Liangliang Lu <luliang@codeaurora.org>