fs/squashfs: sqfs_read_inode_table: fix dangling pointer

inode_table should not be left dangling as it may be freed in sqfs_opendir

Signed-off-by: Richard Genoud <richard.genoud@posteo.net>
diff --git a/fs/squashfs/sqfs.c b/fs/squashfs/sqfs.c
index 1714306..72181f3 100644
--- a/fs/squashfs/sqfs.c
+++ b/fs/squashfs/sqfs.c
@@ -731,6 +731,7 @@
 					      src_table, src_len);
 			if (ret) {
 				free(*inode_table);
+				*inode_table = NULL;
 				goto free_itb;
 			}