commit 3cea4c30 upstream.

Rename front_max field of struct ceph_msg to front_alloc_len to make
its purpose more clear.
Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Sage Weil <sage@inktank.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>