m68k: atari 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/atari/stdma.c b/arch/m68k/atari/stdma.c
index d1bd029..604329f 100644
--- a/arch/m68k/atari/stdma.c
+++ b/arch/m68k/atari/stdma.c
@@ -179,8 +179,9 @@
 void __init stdma_init(void)
 {
 	stdma_isr = NULL;
-	request_irq(IRQ_MFP_FDC, stdma_int, IRQ_TYPE_SLOW | IRQF_SHARED,
-	            "ST-DMA: floppy/ACSI/IDE/Falcon-SCSI", stdma_int);
+	if (request_irq(IRQ_MFP_FDC, stdma_int, IRQ_TYPE_SLOW | IRQF_SHARED,
+			"ST-DMA: floppy/ACSI/IDE/Falcon-SCSI", stdma_int))
+		pr_err("Couldn't register ST-DMA interrupt\n");
 }