Description: xfs: don't fail when converting shortform attr to long form during ATTR_REPLACE
References:
 https://bugzilla.kernel.org/show_bug.cgi?id=199119
 https://bugzilla.suse.com/show_bug.cgi?id=1105025
Notes:
Bugs:
upstream: released (4.17-rc4) [7b38460dc8e4eafba06c78f8e37099d3b34d473c]
4.19-upstream-stable: N/A "Fixed before branch point"
4.9-upstream-stable: released (4.9.144) [4ec44e98ab08c704d0ff1a35a21a0682a5562a27]
3.16-upstream-stable: released (3.16.62) [789a4317666e599e487ec1983643de1b519c431e]
sid: released (4.17.3-1)
4.9-stretch-security: released (4.9.144-1)
3.16-jessie-security: released (3.16.64-1)