qed: Fix an error code qed_ll2_start_xmit()

qed: Fix an error code qed_ll2_start_xmit()

BugLink: https://bugs.launchpad.net/bugs/1837477
[ Upstream commit f07d4276892d97671e880190ff195a288b2d8d92 ]

We accidentally deleted the code to set "rc = -ENOMEM;" and this patch
adds it back.

Fixes: d2201a21598a ("qed: No need for LL2 frags indication")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Andrea Righi <andrea.righi@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>