net: bnx2x: fix variable dereferenced before check

Smatch says:
	bnx2x_init_ops.h:640 bnx2x_ilt_client_mem_op()
	warn: variable dereferenced before check 'ilt' (see line 638)

Move ilt_cli variable initialization _after_ ilt validation, because
it's unsafe to deref the pointer before validation check.

Fixes: 523224a3

 ("bnx2x, cnic, bnx2i: use new FW/HSI")
Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>