ASoC: Intel: Skylake: Fix the memory leak

This provide the fix for firmware memory by freeing the pointer in driver
remove where it is safe to do so

Signed-off-by: Vinod Koul <[e-mail]>
Signed-off-by: Mark Brown <[e-mail]>

sound/soc/intel/skylake/skl-topology.c

···
 	skl->resource.max_mcps = SKL_MAX_MCPS;
 	skl->resource.max_mem = SKL_FW_MAX_MEM;
 
+	skl->tplg = fw;
+
 	return 0;
 }

sound/soc/intel/skylake/skl.c

···
 #include <linux/pci.h>
 #include <linux/pm_runtime.h>
 #include <linux/platform_device.h>
+#include <linux/firmware.h>
 #include <sound/pcm.h>
 #include "skl.h"
 
···
 {
 	struct hdac_ext_bus *ebus = pci_get_drvdata(pci);
 	struct skl *skl = ebus_to_skl(ebus);
+
+	if (skl->tplg)
+		release_firmware(skl->tplg);
 
 	if (pci_dev_run_wake(pci))
 		pm_runtime_get_noresume(&pci->dev);

sound/soc/intel/skylake/skl.h

···
 	struct skl_dsp_resource resource;
 	struct list_head ppl_list;
 	struct list_head dapm_path_list;
+
+	const struct firmware *tplg;
 };
 
 #define skl_to_ebus(s)	(&(s)->ebus)