In the function irdma_reg_user_mr, err and ret exist. Actually,
one variable err is enough.
Signed-off-by: NZhu Yanjun <yanjun.zhu@linux.dev>
Link: https://lore.kernel.org/r/20230104064333.660344-1-yanjun.zhu@intel.comSigned-off-by: NLeon Romanovsky <leon@kernel.org>