isdn: mux_timeslot_provide_bits(): remove unused 'count'

Change-Id: Id2c6d05c56424fa79ade84a29b8b70293dc690e4
diff --git a/src/isdn/i460_mux.c b/src/isdn/i460_mux.c
index 0e84816..b070bbd 100644
--- a/src/isdn/i460_mux.c
+++ b/src/isdn/i460_mux.c
@@ -245,16 +245,14 @@
 /* provide one byte of multiplexed I.460 bits */
 static uint8_t mux_timeslot_provide_bits(struct osmo_i460_timeslot *ts)
 {
-	int i, count = 0;
 	uint8_t ret = 0xff; /* unused bits must be '1' as per I.460 */
 
-	for (i = 0; i < ARRAY_SIZE(ts->schan); i++) {
+	for (int i = 0; i < ARRAY_SIZE(ts->schan); i++) {
 		struct osmo_i460_subchan *schan = &ts->schan[i];
 		uint8_t bits, mask;
 
 		if (schan->rate == OSMO_I460_RATE_NONE)
 			continue;
-		count++;
 		bits = mux_subchan_provide_bits(schan, &mask);
 		ret &= ~mask;
 		ret |= bits;