qed: fix old-style function definition

The newly added file causes a harmless warning, with "make W=1":

drivers/net/ethernet/qlogic/qed/qed_iscsi.c: In function 'qed_get_iscsi_ops':
drivers/net/ethernet/qlogic/qed/qed_iscsi.c:1268:29: warning: old-style function definition [-Wold-style-definition]

This makes it a proper prototype.

Fixes: fc831825f99e ("qed: Add support for hardware offloaded iSCSI.")
Signed-off-by: Arnd Bergmann <[e-mail]>
Reviewed-by: Johannes Thumshirn <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/ethernet/qlogic/qed/qed_iscsi.c

···
 	.get_stats = &qed_iscsi_stats,
 };
 
-const struct qed_iscsi_ops *qed_get_iscsi_ops()
+const struct qed_iscsi_ops *qed_get_iscsi_ops(void)
 {
 	return &qed_iscsi_ops_pass;
 }