ASoC: omap: mcbsp: Remove redundant checks for the st_data pointer

The parent functions of omap_st_start/stop also checks the validity of the
st_data pointer so we do not need to do it again inside of omap_st_start/stop

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Jarkko Nikula <jarkko.nikula@bitmer.com>
Signed-off-by: Liam Girdwood <lrg@ti.com>
diff --git a/sound/soc/omap/mcbsp.c b/sound/soc/omap/mcbsp.c
index 79f6da6..5f6c21d 100644
--- a/sound/soc/omap/mcbsp.c
+++ b/sound/soc/omap/mcbsp.c
@@ -318,7 +318,7 @@
 {
 	struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
 
-	if (st_data && st_data->enabled && !st_data->running) {
+	if (st_data->enabled && !st_data->running) {
 		omap_st_fir_write(mcbsp, st_data->taps);
 		omap_st_chgain(mcbsp);
 
@@ -350,7 +350,7 @@
 {
 	struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
 
-	if (st_data && st_data->running) {
+	if (st_data->running) {
 		if (!mcbsp->free) {
 			omap_st_off(mcbsp);
 			st_data->running = 0;