staging: rtl8192u: Remove unnecessary comment

The <linux/config.h> header file is not used anymore,
so it is commented out in this file.This patch deletes
that unnecessary comment.
Signed-off-by: Navya Sri Nizamkari <navyasri.tech@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8192u/ieee80211/ieee80211_crypt.c

@@ -11,7 +11,6 @@
  *
  */
 
-//#include <linux/config.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/slab.h>