m68k/irq: Remove obsolete support for user vector interrupt fixups

It was used on Apollo only, before its conversion to genirq.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
diff --git a/arch/m68k/bvme6000/config.c b/arch/m68k/bvme6000/config.c
index 1edd950..8128647 100644
--- a/arch/m68k/bvme6000/config.c
+++ b/arch/m68k/bvme6000/config.c
@@ -86,7 +86,7 @@
  */
 static void __init bvme6000_init_IRQ(void)
 {
-	m68k_setup_user_interrupt(VEC_USER, 192, NULL);
+	m68k_setup_user_interrupt(VEC_USER, 192);
 }
 
 void __init config_bvme6000(void)