udf: Define EFSCORRUPTED error code

Similarly to other filesystems define EFSCORRUPTED error code for
reporting internal filesystem corruption.
Signed-off-by: Jan Kara <jack@suse.cz>

fs/udf/udf_sb.h

@@ -55,6 +55,8 @@
 #define MF_DUPLICATE_MD		0x01
 #define MF_MIRROR_FE_LOADED	0x02
 
+#define EFSCORRUPTED EUCLEAN
+
 struct udf_meta_data {
 	__u32	s_meta_file_loc;
 	__u32	s_mirror_file_loc;