Patch for wm_receive when mounted with prefix

Not very elegant, but works
Merge branch 'master' into mountable-with-prefix
Merge branch 'master' into mountable-with-prefix
Merge branch 'master' into mountable-with-prefix
Merge branch 'master' into mountable-with-prefix
Merge pull request #10 from thedod/mountable-with-prefix

wm_receiver fix when mounted with prefix