soundwire: intel: remove useless readl

Cppcheck complains:

drivers/soundwire/intel.c:564:15: style: Variable 'link_control' is
assigned a value that is never used. [unreadVariable]
 link_control = intel_readl(shim, SDW_SHIM_LCTL);

This looks like a leftover from a previous version, remove.
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/20210302091122.13952-9-yung-chuan.liao@linux.intel.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/soundwire/intel.c

@@ -561,8 +561,6 @@ static int intel_link_power_down(struct sdw_intel *sdw)
 		ret = intel_clear_bit(shim, SDW_SHIM_LCTL, link_control, cpa_mask);
 	}
 
-	link_control = intel_readl(shim, SDW_SHIM_LCTL);
-
 	mutex_unlock(sdw->link_res->shim_lock);
 
 	if (ret < 0) {