[MTD] Fix off-by-one error in physmap.c

This patch fixes a simple off-by-one error in the mtd physmap driver.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>

drivers/mtd/maps/physmap.c

@@ -182,7 +182,7 @@ static struct physmap_flash_data physmap_flash_data = {
 
 static struct resource physmap_flash_resource = {
 	.start		= CONFIG_MTD_PHYSMAP_START,
-	.end		= CONFIG_MTD_PHYSMAP_START + CONFIG_MTD_PHYSMAP_LEN,
+	.end		= CONFIG_MTD_PHYSMAP_START + CONFIG_MTD_PHYSMAP_LEN - 1,
 	.flags		= IORESOURCE_MEM,
 };