staging: r8188eu: remove unnecessary type casts

The field rx_data of struct recv_frame and the local variable pframe
both have type (u8 *). Remove unnecessary type casts to (unsigned char *).
Acked-by: Phillip Potter <phil@philpotter.co.uk>
Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20210829112555.8726-4-straube.linux@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/r8188eu/core/rtw_security.c

@@ -145,7 +145,7 @@ void rtw_wep_decrypt(struct adapter *padapter, struct recv_frame *precvframe)
 	struct	rx_pkt_attrib	 *prxattrib = &precvframe->attrib;
 	struct	security_priv	*psecuritypriv = &padapter->securitypriv;
 
-	pframe = (unsigned char *)precvframe->rx_data;
+	pframe = precvframe->rx_data;
 
 	/* start to decrypt recvframe */
 	if ((prxattrib->encrypt == _WEP40_) || (prxattrib->encrypt == _WEP104_)) {
@@ -600,7 +600,7 @@ u32 rtw_tkip_decrypt(struct adapter *padapter, struct recv_frame *precvframe)
 	struct	security_priv	*psecuritypriv = &padapter->securitypriv;
 	u32		res = _SUCCESS;
 
-	pframe = (unsigned char *)precvframe->rx_data;
+	pframe = precvframe->rx_data;
 
 	/* 4 start to decrypt recvframe */
 	if (prxattrib->encrypt == _TKIP_) {
@@ -1412,7 +1412,7 @@ u32 rtw_aes_decrypt(struct adapter *padapter, struct recv_frame *precvframe)
 	struct	security_priv	*psecuritypriv = &padapter->securitypriv;
 	u32	res = _SUCCESS;
 
-	pframe = (unsigned char *)precvframe->rx_data;
+	pframe = precvframe->rx_data;
 
 	/* 4 start to encrypt each fragment */
 	if (prxattrib->encrypt == _AES_) {