ALSA: hda - Don't handle empty patch files

When an empty string is passed to patch option, the driver should
ignore it.  Otherwise it gets an error by trying to load it.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
index 2e91a99..0baffcd 100644 (file)
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -2703,7 +2703,7 @@ static int __devinit azx_probe(struct pci_dev *pci,
        if (err < 0)
                goto out_free;
 #ifdef CONFIG_SND_HDA_PATCH_LOADER
-       if (patch[dev]) {
+       if (patch[dev] && *patch[dev]) {
                snd_printk(KERN_ERR SFX "Applying patch firmware '%s'\n",
                           patch[dev]);
                err = snd_hda_load_patch(chip->bus, patch[dev]);