zfs diff outputs ambigous octal escapes

[dasjoe]

To reproduce create some files where digits follow an escaped character, like digits 123 here:

root@sbooblehat:/zfs_test# ll
total 35
drwxr-xr-x  2 root root  6 May 15 23:06 ./
drwxr-xr-x 22 root root 24 May 15 23:03 ../
-rw-r--r--  1 root root  0 May 15 23:04 a file with spaces and umlauts like äü
-rw-r--r--  1 root root  0 May 15 23:04 a file with ß
-rw-r--r--  1 root root  0 May 15 23:03 äöü
-rw-r--r--  1 root root  0 May 15 23:06 digits 123
root@sbooblehat:/zfs_test# echo -e "$(zfs diff sbooblehat-rpool/ROOT/vivid/zfs_test@1 sbooblehat-rpool/ROOT/vivid/zfs_test@2)"
M   /zfs_test/
+   /zfs_test/\303\244\303\266\303\274
+   /zfs_test/a file with spaces and umlauts like \303\244\303\274
+   /zfs_test/a file with \303\237
+   /zfs_test/digits�23

As a workaround I prepend the escaped values with 0:

root@sbooblehat:/zfs_test# zfs diff sbooblehat-rpool/ROOT/vivid/zfs_test@1 sbooblehat-rpool/ROOT/vivid/zfs_test@2 | echo -e "$(sed 's/\\\([0-9]\{3\}\)/\\0\1/g')"
M   /zfs_test/
+   /zfs_test/äöü
+   /zfs_test/a file with spaces and umlauts like äü
+   /zfs_test/a file with ß
+   /zfs_test/digits 123