ASoC: cygnus: Remove unnecessary active_slots check

Variable active_slots is unsigned so checking whether it is less than
zero is not necessary.
Signed-off-by: Christos Gkekas <chris.gekas@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/bcm/cygnus-ssp.c

@@ -986,7 +986,7 @@ static int cygnus_set_dai_tdm_slot(struct snd_soc_dai *cpu_dai,
 
 	active_slots = hweight32(tx_mask);
 
-	if ((active_slots < 0) || (active_slots > 16))
+	if (active_slots > 16)
 		return -EINVAL;
 
 	/* Slot value must be even */