staging: rtl8712: rtl871x_io: Remove unused function

Drop function that is declared but not called anywhere.
Signed-off-by: Amitoj Kaur Chawla <amitoj1606@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8712/rtl871x_io.h

@@ -232,14 +232,6 @@ struct io_queue {
 	struct	intf_hdl intf;
 };
 
-static inline u32 _RND4(u32 sz)
-{
-	u32	val;
-
-	val = ((sz >> 2) + ((sz & 3) ? 1 : 0)) << 2;
-	return val;
-}
-
 u8 r8712_read8(struct _adapter *adapter, u32 addr);
 u16 r8712_read16(struct _adapter *adapter, u32 addr);
 u32 r8712_read32(struct _adapter *adapter, u32 addr);