i7300_idle: Fix compile warning CONFIG_I7300_IDLE_IOAT_CHANNEL not defined

When I7300_idle driver is not configured, there is a compile time
warning about IDLE_IOAT_CHANNEL not defined. Fix it.

Reported-by: Suresh Siddha <suresh.b.siddha@intel.com>
Reported-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
diff --git a/drivers/dma/ioat_dma.c b/drivers/dma/ioat_dma.c
index fd1631d..c6d0ca2 100644
--- a/drivers/dma/ioat_dma.c
+++ b/drivers/dma/ioat_dma.c
@@ -172,7 +172,7 @@
 	xfercap_scale = readb(device->reg_base + IOAT_XFERCAP_OFFSET);
 	xfercap = (xfercap_scale == 0 ? -1 : (1UL << xfercap_scale));
 
-#if CONFIG_I7300_IDLE_IOAT_CHANNEL
+#ifdef  CONFIG_I7300_IDLE_IOAT_CHANNEL
 	if (i7300_idle_platform_probe(NULL, NULL) == 0) {
 		device->common.chancnt--;
 	}