mtd: sm_ftl: Fix memory leak in sm_init_zone() error path

In sm_init_zone(), 'zone->lba_to_phys_table' is allocated through
kmalloc_array() and 'zone->free_sectors' is allocated in kfifo_alloc()
respectively. However, they are not deallocated in the following execution
if sm_read_sector() fails, leading to memory leaks. To fix this issue, free
them before returning -EIO.

Signed-off-by: Wenwen Wang <[e-mail]>
Signed-off-by: Richard Weinberger <[e-mail]>

drivers/mtd/sm_ftl.c

···
 			continue;
 
 		/* Read the oob of first sector */
-		if (sm_read_sector(ftl, zone_num, block, 0, NULL, &oob))
+		if (sm_read_sector(ftl, zone_num, block, 0, NULL, &oob)) {
+			kfifo_free(&zone->free_sectors);
+			kfree(zone->lba_to_phys_table);
 			return -EIO;
+		}
 
 		/* Test to see if block is erased. It is enough to test
 			first sector, because erase happens in one shot */