staging: rtl8192u: v3 Coding style changes. Plus one change to use memset()

[John Whitmore]

Simple coding style changes to single file drivers/staging/rtl8192u/ieee80211/rtl819x_HTProc.c

Given feedback on some of the comments, I truncated to the 80 character limit,
in code, (as opposed to function block comments). I have left a number of the
contentious comments as they are.

Another piece of feedback suggested using memset() instead of a loop to
initialise memory so I've added that change to the set.