lib/file/afs_open: initialise new files as zero length
lib/file/afs_open: initialise new files as zero length

Truncate or write (which calls truncate) calls can be used extend a
file's size after creation.

Signed-off-by: David Disseldorp <589a549dc9f982d9f46aeeb82a09ab6d87ccf1d8@suse.de>

ddiss/elasto,ddiss/elasto