mtd: sm_ftl: cosmetic, use bool when possible

I didn't know that kernel allows use of that typedef.
Signed-off-by: NMaxim Levitsky <maximlevitsky@gmail.com>
Signed-off-by: NArtem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

drivers/mtd/sm_ftl.h

@@ -20,7 +20,7 @@
 
 
 struct ftl_zone {
-	int initialized;
+	bool initialized;
 	int16_t *lba_to_phys_table;		/* LBA to physical table */
 	struct kfifo free_sectors;	/* queue of free sectors */
 };
@@ -37,8 +37,8 @@ struct sm_ftl {
 	int zone_count;			/* number of zones */
 	int max_lba;			/* maximum lba in a zone */
 	int smallpagenand;		/* 256 bytes/page nand */
-	int readonly;			/* is FS readonly */
-	int unstable;
+	bool readonly;			/* is FS readonly */
+	bool unstable;
 	int cis_block;			/* CIS block location */
 	int cis_boffset;		/* CIS offset in the block */
 	int cis_page_offset;		/* CIS offset in the page */
@@ -49,7 +49,7 @@ struct sm_ftl {
 	int cache_zone;			/* zone of cached block */
 	unsigned char *cache_data;	/* cached block data */
 	long unsigned int cache_data_invalid_bitmap;
-	int cache_clean;
+	bool cache_clean;
 	struct work_struct flush_work;
 	struct timer_list timer;