mtd: maps: add missing iounmap() in error path

This patch was triggered by the following Coccinelle error:

./drivers/mtd/maps/sc520cdp.c:246:3-9: \
ERROR: missing iounmap; ioremap on line 242 \
and execution via conditional on line 244

Since do_map_probe() is also invoked in this loop, it is also necessary to
map_destroy() any initialised struct mtd_info.

Signed-off-by: Luis Henriques <[e-mail]>
Reviewed-by: Marek Vasut <[e-mail]>
Signed-off-by: Brian Norris <[e-mail]>

drivers/mtd/maps/sc520cdp.c

···
 
 static int __init init_sc520cdp(void)
 {
-	int i, devices_found = 0;
+	int i, j, devices_found = 0;
 
 #ifdef REPROGRAM_PAR
 	/* reprogram PAR registers so flash appears at the desired addresses */
···
 
 		if (!sc520cdp_map[i].virt) {
 			printk("Failed to ioremap_nocache\n");
+			for (j = 0; j < i; j++) {
+				if (mymtd[j]) {
+					map_destroy(mymtd[j]);
+					iounmap(sc520cdp_map[j].virt);
+				}
+			}
 			return -EIO;
 		}