The find command fill print only a filename if
given a filename, so it is sufficient to remove
the check for a directory

Now you can call this script with both directories
and files, and it will clean either the entire directory
recursively, or the individual file.

Change-Id: Iee0e381b76fb42f7b9e610d93b7fb235611c87ff
Signed-off-by: Hugh Davenport <hugh@catalyst.net.nz>