Staging: fbtft: fb_agm1264k-fl: Remove unnecessary cast

Remove explicit typecast from variables as compiler can typecast
implicitly.
Semantic patch used:

@@
type T;
T e;
identifier x;
@@

* T x = (T)e;
Signed-off-by: Shivani Bhardwaj <shivanib134@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/fbtft/fb_agm1264k-fl.c

@@ -177,7 +177,7 @@ static void write_reg8_bus8(struct fbtft_par *par, int len, ...)
 {
 	va_list args;
 	int i, ret;
-	u8 *buf = (u8 *)par->buf;
+	u8 *buf = par->buf;
 
 	if (unlikely(par->debug & DEBUG_WRITE_REGISTER)) {
 		va_start(args, len);