mtd: denali: make init function static

It's only used in this file.

Signed-off-by: Brian Norris <computersforpeace@gmail.com>
diff --git a/drivers/mtd/nand/denali.c b/drivers/mtd/nand/denali.c
index 2ed2bb3..154b033 100644
--- a/drivers/mtd/nand/denali.c
+++ b/drivers/mtd/nand/denali.c
@@ -1394,7 +1394,7 @@
 };
 
 /* initialize driver data structures */
-void denali_drv_init(struct denali_nand_info *denali)
+static void denali_drv_init(struct denali_nand_info *denali)
 {
 	denali->idx = 0;