Test MountTest.GetMntInfo fails with "Expected: (onlen) >= (1), actual: 0 vs 1"

[dougburns]

Running the test suite results in a test failure because getmntinfo returns an element with a zero length value in f_mntonname.

From the documentation for the w_getmntent function, I suspect this is because the userid running the tests does not have access to all of the mount points:

"If the caller of w_getmntent() lacks search authorization to one or more of the directories in the mount point pathname, mnt_mountpoint is returned empty. That is, mnt_pathlen is zero and mnt_mountpoint contains a NULL as the first character."

I don't know whether this should be handled in the function or requires a modification to the test.