ASoC: Intel: Skylake: Delete an unnecessary check before the function call "release_firmware"

The release_firmware() function tests whether its argument is NULL and then
returns immediately. Thus the test around the call is not needed.

This issue was detected by using the Coccinelle software.
Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/intel/skylake/skl.c

@@ -781,8 +781,7 @@ static void skl_remove(struct pci_dev *pci)
 	struct hdac_ext_bus *ebus = pci_get_drvdata(pci);
 	struct skl *skl = ebus_to_skl(ebus);
 
-	if (skl->tplg)
-		release_firmware(skl->tplg);
+	release_firmware(skl->tplg);
 
 	if (pci_dev_run_wake(pci))
 		pm_runtime_get_noresume(&pci->dev);