staging: r8188eu: remove rtw_set_ie_secondary_ch_offset()

Function rtw_set_ie_secondary_ch_offset() is not used, remove it.
Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20210922200420.9693-41-straube.linux@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/r8188eu/core/rtw_ieee80211.c

@@ -140,11 +140,6 @@ u8 *rtw_set_ie
 	return pbuf + len + 2;
 }
 
-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);
-}
-
 /*----------------------------------------------------------------------------
 index: the information element id index, limit is the limit for search
 -----------------------------------------------------------------------------*/

drivers/staging/r8188eu/include/ieee80211.h

@@ -1095,8 +1095,6 @@ enum secondary_ch_offset {
 	SCA = 1, /* secondary channel above */
 	SCB = 3,  /* secondary channel below */
 };
-u8 *rtw_set_ie_secondary_ch_offset(u8 *buf, u32 *buf_len,
-				   u8 secondary_ch_offset);
 
 u8 *rtw_get_ie(u8 *pbuf, int index, int *len, int limit);