cxgb4: Fix error handling in alloc_uld_rxqs().

Fix to release resources properly in error handling path of
alloc_uld_rxqs(), This patch also removes unwanted arguments
and avoids calling the same function twice.

Fixes: 94cdb8bb (cxgb4: Add support for dynamic allocation
       of resources for ULD
Signed-off-by: Ganesh Goudar <ganeshgr@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>