[MTD] Initialize 'writesize'

Signed-off-by: Artem B. Bityutskiy <dedekind@infradead.org>
diff --git a/drivers/mtd/devices/slram.c b/drivers/mtd/devices/slram.c
index b3f665e..542a0c0 100644
--- a/drivers/mtd/devices/slram.c
+++ b/drivers/mtd/devices/slram.c
@@ -209,6 +209,7 @@
 	(*curmtd)->mtdinfo->owner = THIS_MODULE;
 	(*curmtd)->mtdinfo->type = MTD_RAM;
 	(*curmtd)->mtdinfo->erasesize = SLRAM_BLK_SZ;
+	(*curmtd)->mtdinfo->writesize = 1;
 
 	if (add_mtd_device((*curmtd)->mtdinfo))	{
 		E("slram: Failed to register new device\n");