ALSA: hda: patch_hdmi: remove warnings with empty body

make W=1 reports the following warnings, fix as suggested

sound/pci/hda/patch_hdmi.c: In function ‘hdmi_non_intrinsic_event’:
sound/pci/hda/patch_hdmi.c:824:3: warning: suggest braces around empty
body in an ‘if’ statement [-Wempty-body]
  824 |   ;
      |   ^
sound/pci/hda/patch_hdmi.c:826:3: warning: suggest braces around empty
body in an ‘if’ statement [-Wempty-body]
  826 |   ;
      |   ^
Signed-off-by: NPierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20200113211405.28070-3-pierre-louis.bossart@linux.intel.comSigned-off-by: NTakashi Iwai <tiwai@suse.de>

sound/pci/hda/patch_hdmi.c

@@ -820,10 +820,12 @@ static void hdmi_non_intrinsic_event(struct hda_codec *codec, unsigned int res)
 		cp_ready);
 
 	/* TODO */
-	if (cp_state)
+	if (cp_state) {
 		;
-	if (cp_ready)
+	}
+	if (cp_ready) {
 		;
+	}
 }