btrfs-progs: fsck-tests: add test case to check symlinks with bad flags

There are two bad symlinks in the test case.  One is with immutable
attribute.  Another one is with append attribute.

Signed-off-by: Su Yue <suy.fnst@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>

tests/fsck-tests/034-bad-inode-flags/test.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+# In order to confirm that 'btrfs check' supports checking symlinks
+# with immutable/append attributes that are not possible to set by standard
+# syscall or ioctl so they're handled as corruption
+
+source "$TEST_TOP/common"
+
+check_prereq btrfs
+
+check_image() {
+	run_mustfail "check should report errors about inode flags" \
+        $SUDO_HELPER "$TOP/btrfs" check "$1"
+}
+
+check_all_images