smbclient: fix string formatting in print command

smbclient: fix string formatting in print command

At one time, the variables lname and rname were char arrays, but now they
are pointers. When they were arrays, sizeof(rname) was the length of the
array, but now it gives the size of the pointer which is not what we want.

In the case where the filename is -, rname was alloced as size 1, which
could never fit the name it wanted to have contain ("stdin-<pid>").

Signed-off-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Reviewed-by: Jeremy Allison <jra@samba.org>