lxc: correctly backport /dev/tty fix

https://bugzilla.redhat.com/show_bug.cgi?id=982317

maint-only patch; reported by Geert Jansen

Commit 17cdc298 tried to backport upstream 90a0c6d, but in
resolving conflicts, failed to account that upstream commit
e1d32bb9 refactored code to leave off a leading /dev.

* src/lxc/lxc_container.c (lxcContainerPopulateDevices): Use
correct device name.
Signed-off-by: NEric Blake <eblake@redhat.com>

src/lxc/lxc_container.c

@@ -839,7 +839,7 @@ static int lxcContainerPopulateDevices(char **ttyPaths, size_t nttyPaths)
         { LXC_DEV_MAJ_MEMORY, LXC_DEV_MIN_FULL, 0666, "/dev/full" },
         { LXC_DEV_MAJ_MEMORY, LXC_DEV_MIN_RANDOM, 0666, "/dev/random" },
         { LXC_DEV_MAJ_MEMORY, LXC_DEV_MIN_URANDOM, 0666, "/dev/urandom" },
-        { LXC_DEV_MAJ_TTY, LXC_DEV_MIN_TTY, 0666, "/tty" },
+        { LXC_DEV_MAJ_TTY, LXC_DEV_MIN_TTY, 0666, "/dev/tty" },
     };
     const struct {
         const char *src;