common: fb_nand: won't compile

Somehow this got overlooked when getting rid of nand_info.

Small patch, won't affect anything else, no reason to wait for the
next cycle.

Signed-off-by: Sergey Kubushyn <ksi@koi8.net>
diff --git a/common/fb_nand.c b/common/fb_nand.c
index e55ea38..ae34f48 100644
--- a/common/fb_nand.c
+++ b/common/fb_nand.c
@@ -34,7 +34,7 @@
 }
 
 static int fb_nand_lookup(const char *partname, char *response,
-			  struct mtd_info **nand,
+			  struct mtd_info **mtd,
 			  struct part_info **part)
 {
 	struct mtd_device *dev;