omfs: remove unnecessary dentry_unhash on rmdir, dir rneame
omfs: remove unnecessary dentry_unhash on rmdir, dir rneame

omfs does not have problems with references to unlinked directories.

CC: Bob Copeland <b1c1d8736f20db3fb6c1c66bb1455ed43909f0d8@bobcopeland.com>
CC: 3f308d958c7f1165b17ccc8d85f6905e51941bea@lists.sourceforge.net
Signed-off-by: Sage Weil <6dd34506bbd5e58221bbb3e4732d97c91f02277b@newdream.net>
Signed-off-by: Al Viro <de609eb4d5d70b1d38ec6642adbfc33a2781f63c@zeniv.linux.org.uk>

TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs