ASoC: Don't use -1 to boostrap subseq so it can be used by drivers

Makes life a little easier if you want to add subsequences to an existing
driver as you can use -1 to put things at the start of sequences.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/soc-dapm.c

@@ -989,7 +989,7 @@ static void dapm_seq_run(struct snd_soc_dapm_context *dapm,
 
 			INIT_LIST_HEAD(&pending);
 			cur_sort = -1;
-			cur_subseq = -1;
+			cur_subseq = INT_MIN;
 			cur_reg = SND_SOC_NOPM;
 			cur_dapm = NULL;
 		}