staging: vt6656: Fix CamelCase warnings in macro

This patch fixes the checkpatch.pl warnings like:
- CHECK: Avoid CamelCase: <uVar>
Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/53072a97348b08276b083ce18188b9199cbfaae6.1645477326.git.philipp.g.hortmann@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/vt6656/device.h

@@ -381,11 +381,11 @@ struct vnt_private {
 	struct ieee80211_low_level_stats low_stats;
 };
 
-#define ADD_ONE_WITH_WRAP_AROUND(uVar, uModulo) {	\
-	if ((uVar) >= ((uModulo) - 1))			\
-		(uVar) = 0;				\
+#define ADD_ONE_WITH_WRAP_AROUND(var, modulo) {	\
+	if ((var) >= ((modulo) - 1))			\
+		(var) = 0;				\
 	else						\
-		(uVar)++;				\
+		(var)++;				\
 }
 
 int vnt_init(struct vnt_private *priv);