staging: rtl8192e: Remove rtllib_is_shortslot()

This function was declared but never unused.
Signed-off-by: Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8192e/rtllib.h

@@ -2170,7 +2170,6 @@ extern int rtllib_wx_set_gen_ie(struct rtllib_device *ieee, u8 *ie, size_t len);
 
 /* rtllib_softmac.c */
 extern short rtllib_is_54g(struct rtllib_network *net);
-extern short rtllib_is_shortslot(const struct rtllib_network *net);
 extern int rtllib_rx_frame_softmac(struct rtllib_device *ieee,
 				   struct sk_buff *skb,
 				   struct rtllib_rx_stats *rx_stats, u16 type,

drivers/staging/rtl8192e/rtllib_softmac.c

@@ -28,11 +28,6 @@ short rtllib_is_54g(struct rtllib_network *net)
 	return (net->rates_ex_len > 0) || (net->rates_len > 4);
 }
 
-short rtllib_is_shortslot(const struct rtllib_network *net)
-{
-	return net->capability & WLAN_CAPABILITY_SHORT_SLOT_TIME;
-}
-
 /* returns the total length needed for placing the RATE MFIE
  * tag and the EXTENDED RATE MFIE tag if needed.
  * It encludes two bytes per tag for the tag itself and its len