staging/mt29f_spinand: fix build error when ONDIEECC not enabled

Fix build error when CONFIG_MTD_SPINAND_ONDIEECC is not enabled
by moving an inline function outside of that #ifdef block.

drivers/staging/mt29f_spinand/mt29f_spinand.c: In function 'spinand_read_byte':
drivers/staging/mt29f_spinand/mt29f_spinand.c:665:9: error: implicit declaration of function 'mtd_to_state' [-Werror=implicit-function-declaration]
drivers/staging/mt29f_spinand/mt29f_spinand.c:665:32: warning: initialization makes pointer from integer without a cast [enabled by default]
drivers/staging/mt29f_spinand/mt29f_spinand.c: In function 'spinand_write_buf':
drivers/staging/mt29f_spinand/mt29f_spinand.c:700:32: warning: initialization makes pointer from integer without a cast [enabled by default]
drivers/staging/mt29f_spinand/mt29f_spinand.c: In function 'spinand_read_buf':
drivers/staging/mt29f_spinand/mt29f_spinand.c:707:32: warning: initialization makes pointer from integer without a cast [enabled by default]

Signed-off-by: Randy Dunlap <[e-mail]>
Reported-by: kbuild test robot <[e-mail]>
Cc: Kamlakant Patel <[e-mail]>
Cc: Mona Anonuevo <[e-mail]>
Cc: [e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/mt29f_spinand/mt29f_spinand.c

···
 /*
  * OOB area specification layout:  Total 32 available free bytes.
  */
-#ifdef CONFIG_MTD_SPINAND_ONDIEECC
-static int enable_hw_ecc;
-static int enable_read_hw_ecc;
 
 static inline struct spinand_state *mtd_to_state(struct mtd_info *mtd)
 {
···
 
 	return state;
 }
+
+#ifdef CONFIG_MTD_SPINAND_ONDIEECC
+static int enable_hw_ecc;
+static int enable_read_hw_ecc;
 
 static struct nand_ecclayout spinand_oob_64 = {
 	.eccbytes = 24,