staging: r8188eu: Remove unused static inline functions in rtw_recv.h

After commit 987219ad ("staging: r8188eu: remove lines from Makefile
that silence build warnings"), clang warns several times:

In file included from
drivers/staging/r8188eu/os_dep/../include/drv_types.h:22:
drivers/staging/r8188eu/os_dep/../include/rtw_recv.h:395:9: warning:
variable 'buf_desc' is uninitialized when used here [-Wuninitialized]
        return buf_desc;
               ^~~~~~~~
drivers/staging/r8188eu/os_dep/../include/rtw_recv.h:391:25: note:
initialize the variable 'buf_desc' to silence this warning
        unsigned char *buf_desc;
                               ^
                                = NULL
drivers/staging/r8188eu/os_dep/../include/rtw_recv.h:412:52: warning:
variable 'buf_star' is uninitialized when used here [-Wuninitialized]
        precv_frame = rxmem_to_recvframe((unsigned char *)buf_star);
                                                          ^~~~~~~~
drivers/staging/r8188eu/os_dep/../include/rtw_recv.h:410:14: note:
initialize the variable 'buf_star' to silence this warning
        u8 *buf_star;
                    ^
                     = NULL
2 warnings generated.

The functions that these warnings come from are not used or are called
from functions that are not used so just remove them to remove the
warnings.
Acked-by: Phillip Potter <phil@philpotter.co.uk>
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Link: https://lore.kernel.org/r/20210812204027.338872-2-nathan@kernel.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/r8188eu/include/rtw_recv.h

@@ -386,52 +386,6 @@ static inline u8 *recvframe_pull_tail(struct recv_frame *precvframe, int sz)
 	return precvframe->rx_tail;
 }
 
-static inline unsigned char *get_rxbuf_desc(struct recv_frame *precvframe)
-{
-	unsigned char *buf_desc;
-
-	if (precvframe == NULL)
-		return NULL;
-	return buf_desc;
-}
-
-static inline struct recv_frame *rxmem_to_recvframe(u8 *rxmem)
-{
-	/* due to the design of 2048 bytes alignment of recv_frame,
-	 * we can reference the struct recv_frame */
-	/* from any given member of recv_frame. */
-	/*  rxmem indicates the any member/address in recv_frame */
-
-	return (struct recv_frame *)(((size_t)rxmem >> RXFRAME_ALIGN) << RXFRAME_ALIGN);
-}
-
-static inline struct recv_frame *pkt_to_recvframe(struct sk_buff *pkt)
-{
-	u8 *buf_star;
-	struct recv_frame *precv_frame;
-	precv_frame = rxmem_to_recvframe((unsigned char *)buf_star);
-
-	return precv_frame;
-}
-
-static inline u8 *pkt_to_recvmem(struct sk_buff *pkt)
-{
-	/*  return the rx_head */
-
-	struct recv_frame *precv_frame = pkt_to_recvframe(pkt);
-
-	return	precv_frame->rx_head;
-}
-
-static inline u8 *pkt_to_recvdata(struct sk_buff *pkt)
-{
-	/*  return the rx_data */
-
-	struct recv_frame *precv_frame = pkt_to_recvframe(pkt);
-
-	return	precv_frame->rx_data;
-}
-
 static inline int get_recvframe_len(struct recv_frame *precvframe)
 {
 	return precvframe->len;