[CIFS] Fix endianness bug in new cifs_readdir2 in calculating dir entry name length. Fix "badness in" message on rmmod cifs caused by rename of 
/proc/fs/cifs/NewReaddirEnabled config switch (pointed out by Shaggy).   

Fix improper clearing of UNIX_BASIC_INFO cifs struct. 
Pointed out by Stefan Rompf.

Signed-off-by: David Kleikamp (shaggy@austin.ibm.com)
Signed-off-by: Steve French (sfrench@us.ibm.com)