int ntfs_nlstoucs (const ntfs_volume * vol, const char * ins, const int ins_len, uchar_t ** outs);
Convert the input string ins, which is in whatever format the loaded NLS map dictates, into a little endian, 2-byte Unicode string.
This function allocates the string and the caller is responsible for calling kmem_cache_free(ntfs_name_cache, outs); when finished with it.
On success the function returns the number of Unicode characters written to the output string *outs (>= 0), not counting the terminating Unicode NULL character. *outs is set to the allocated output string buffer.
On error, a negative number corresponding to the error code is returned. In that case the output string is not allocated. Both *outs and *outs_len are then undefined.
This might look a bit odd due to fast path optimization...