The common kernel pattern is to check for error, not success.  Flip the if
statement accordingly and keep the main flow unindented.

Link: https://lore.kernel.org/r/20200706120343.10816-2-galpress@amazon.comSigned-off-by: Gal Pressman <galpress@amazon.com>
Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>