staging: r8188eu: remove hal_ch_offset_to_secondary_ch_offset function

Driver does not use this function.
Signed-off-by: Ivan Safonov <insafonov@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8188eu/core/rtw_ieee80211.c

@@ -166,18 +166,6 @@ inline u8 *rtw_set_ie_ch_switch(u8 *buf, u32 *buf_len, u8 ch_switch_mode,
 	return rtw_set_ie(buf, WLAN_EID_CHANNEL_SWITCH,  3, ie_data, buf_len);
 }
 
-inline u8 hal_ch_offset_to_secondary_ch_offset(u8 ch_offset)
-{
-	if (ch_offset == HAL_PRIME_CHNL_OFFSET_DONT_CARE)
-		return SCN;
-	else if (ch_offset == HAL_PRIME_CHNL_OFFSET_LOWER)
-		return SCB;
-	else if (ch_offset == HAL_PRIME_CHNL_OFFSET_UPPER)
-		return SCA;
-
-	return SCN;
-}
-
 inline u8 *rtw_set_ie_secondary_ch_offset(u8 *buf, u32 *buf_len, u8 secondary_ch_offset)
 {
 	return rtw_set_ie(buf, WLAN_EID_SECONDARY_CHANNEL_OFFSET,  1, &secondary_ch_offset, buf_len);

drivers/staging/rtl8188eu/include/ieee80211.h

@@ -1096,7 +1096,6 @@ enum secondary_ch_offset {
 	SCA = 1, /* secondary channel above */
 	SCB = 3,  /* secondary channel below */
 };
-u8 hal_ch_offset_to_secondary_ch_offset(u8 ch_offset);
 u8 *rtw_set_ie_ch_switch(u8 *buf, u32 *buf_len, u8 ch_switch_mode,
 			 u8 new_ch, u8 ch_switch_cnt);
 u8 *rtw_set_ie_secondary_ch_offset(u8 *buf, u32 *buf_len,