coverity: fix mount_entry_create_dir_file
coverity: fix mount_entry_create_dir_file

First, fix use of uninitialized variable 'ret'.  Then, actually use
the value it returned in its caller.

Signed-off-by: Serge Hallyn <3df611b026e4639bee8aef7a4beb2e39fcebb313@ubuntu.com>

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