m68k: mac core - Kill warn_unused_result warnings

warning: ignoring return value of 'request_irq', declared with attribute
warn_unused_result

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
diff --git a/arch/m68k/mac/macints.c b/arch/m68k/mac/macints.c
index 7d0cbf3..2371107 100644
--- a/arch/m68k/mac/macints.c
+++ b/arch/m68k/mac/macints.c
@@ -250,8 +250,9 @@
 	if (baboon_present)
 		baboon_register_interrupts();
 	iop_register_interrupts();
-	request_irq(IRQ_AUTO_7, mac_nmi_handler, 0, "NMI",
-			mac_nmi_handler);
+	if (request_irq(IRQ_AUTO_7, mac_nmi_handler, 0, "NMI",
+			mac_nmi_handler))
+		pr_err("Couldn't register NMI\n");
 #ifdef DEBUG_MACINTS
 	printk("mac_init_IRQ(): Done!\n");
 #endif