IB/qib: Fix memory leak in qib_user_sdma_queue_pkts()

IB/qib: Fix memory leak in qib_user_sdma_queue_pkts()

The wrong goto label was used for the error case and missed cleanup of the
pkt allocation.

Fixes: cf7cf57b5f46 ("IB/qib: Protect from buffer overflow in struct qib_user_sdma_pkt fields")
Link: https://lore.kernel.org/r/20211208175238.29983-1-jose.exposito89@gmail.com
Addresses-Coverity-ID: 1493352 ("Resource leak")
Signed-off-by: José Expósito <jose.exposito89@gmail.com>
Acked-by: Mike Marciniszyn <mike.marciniszyn@cornelisnetworks.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>