soundwire: stream: remove useless initialization

Cppcheck complains about possible null pointer dereferences, but it's
more like there are unnecessary initializations before walking
through a list.
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20210302091122.13952-11-yung-chuan.liao@linux.intel.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/soundwire/stream.c

@@ -261,7 +261,7 @@ static int sdw_program_master_port_params(struct sdw_bus *bus,
  */
 static int sdw_program_port_params(struct sdw_master_runtime *m_rt)
 {
-	struct sdw_slave_runtime *s_rt = NULL;
+	struct sdw_slave_runtime *s_rt;
 	struct sdw_bus *bus = m_rt->bus;
 	struct sdw_port_runtime *p_rt;
 	int ret = 0;
@@ -1470,7 +1470,7 @@ static void sdw_acquire_bus_lock(struct sdw_stream_runtime *stream)
  */
 static void sdw_release_bus_lock(struct sdw_stream_runtime *stream)
 {
-	struct sdw_master_runtime *m_rt = NULL;
+	struct sdw_master_runtime *m_rt;
 	struct sdw_bus *bus = NULL;
 
 	/* Iterate for all Master(s) in Master list */