Staging: rtl8187se: Remove C99 style commenting

This patch fixes the checkpatch.pl warning
"do not use C99 // comments"
in ieee80211/ieee80211_softmac.c.

Signed-off-by: Himangi Saraogi <himangi774@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>