staging: erofs: add the missing break in z_erofs_map_blocks_iter

This patch adds a missing break after adding the default case.
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/erofs/unzip_vle.c

@@ -1599,6 +1599,7 @@ int z_erofs_map_blocks_iter(struct inode *inode,
 	case Z_EROFS_VLE_CLUSTER_TYPE_PLAIN:
 		if (ofs_rem >= logical_cluster_ofs)
 			map->m_flags ^= EROFS_MAP_ZIPPED;
+		/* fallthrough */
 	case Z_EROFS_VLE_CLUSTER_TYPE_HEAD:
 		if (ofs_rem == logical_cluster_ofs) {
 			pcn = le32_to_cpu(di->di_u.blkaddr);
@@ -1619,11 +1620,13 @@ int z_erofs_map_blocks_iter(struct inode *inode,
 			goto unmap_out;
 		}
 		end = (lcn-- * clustersize) | logical_cluster_ofs;
+		/* fallthrough */
 	case Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD:
 		/* get the correspoinding first chunk */
 		ofs = vle_get_logical_extent_head(inode, mpage_ret,
 			&kaddr, lcn, &pcn, &map->m_flags);
 		mpage = *mpage_ret;
+		break;
 	default:
 		errln("unknown cluster type %u at offset %llu of nid %llu",
 			cluster_type, ofs, EROFS_V(inode)->nid);