mtd: atmel_nand: fix warning: 'part_probes' defined but not used

This patch fixes

drivers/mtd/nand/atmel_nand.c:372: warning: 'part_probes' defined but not used

which is issued when CONFIG_MTD_PARTITIONS is defined but
CONFIG_MTD_CMDLINE_PARTS not.

Signed-off-by: Andreas Bießmann <biessmann@corscience.de>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c
index 04d30887c..ccce0f0 100644
--- a/drivers/mtd/nand/atmel_nand.c
+++ b/drivers/mtd/nand/atmel_nand.c
@@ -364,7 +364,7 @@
 	}
 }
 
-#ifdef CONFIG_MTD_PARTITIONS
+#ifdef CONFIG_MTD_CMDLINE_PARTS
 static const char *part_probes[] = { "cmdlinepart", NULL };
 #endif