Staging: rtl8188eu: Removed unneeded code.

This patch removes some unneeded code.
1) kzalloc() allocates 4 extra bytes so that we can align the return
   value.  But actually the return value is already aligned so we can
   remove the + 4 and the call to N_BYTE_ALIGMENT().
2) The memset() isn't needed because kzalloc() zeroes the allocation.

Suggested-by: Larry Finger <Larry.Finger@lwfinger.net>

Signed-off-by: Adrian Remonda <adrianremonda@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>