RDMA/bnxt_re: Remove some dead code

If the probe succeeds, then auxiliary_get_drvdata() can't return a NULL
pointer.

So several NULL checks can be removed to simplify code.

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://patch.msgid.link/f02eb630734ee530315dce9f60b078f631ae93d0.1730477345.git.christophe.jaillet@wanadoo.fr


Signed-off-by: Leon Romanovsky <leon@kernel.org>