afs: Fix afs_xattr_get_yfs() to not try freeing an error value
afs_xattr_get_yfs() tries to free yacl, which may hold an error value (say if yfs_fs_fetch_opaque_acl() failed and returned an error). Fix this by allocating yacl up front (since it's a fixed-length struct, unlike afs_acl) and passing it in to the RPC function. This also allows the flags to be placed in the object rather than passing them through to the RPC function. Fixes: ae46578b ("afs: Get YFS ACLs and information through xattrs") Signed-off-by: David Howells <dhowells@redhat.com>
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