RDMA/rxe: Clean kzalloc failure paths

RDMA/rxe: Clean kzalloc failure paths

There is no need to print any debug messages after failure to
allocate memory, because kernel will print OOM dumps anyway.

Together with removal of these messages, remove useless goto jumps.

Fixes: 5bf944f24129 ("RDMA/rxe: Add error messages")
Reported-by: Dan Carpenter <error27@gmail.com>
Link: https://lore.kernel.org/all/ea43486f-43dd-4054-b1d5-3a0d202be621@kili.mountain
Link: https://lore.kernel.org/r/d3cedf723b84e73e8062a67b7489d33802bafba2.1680113597.git.leon@kernel.org
Reviewed-by: Bob Pearson <rpearsonhpe@gmail.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>