drivers:staging:vt6656: Fix coding style issues

This patch fixes the following issues reported by checkpatch.pl:
- code indent should use tabs where possible
Signed-off-by: NSergey Lysanov <lysanovsergey@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/vt6656/power.c

@@ -103,7 +103,7 @@ void vnt_disable_power_saving(struct vnt_private *priv)
 
 	/* disable power saving hw function */
 	vnt_control_out(priv, MESSAGE_TYPE_DISABLE_PS, 0,
-	                0, 0, NULL);
+			0, 0, NULL);
 
 	/* clear AutoSleep */
 	vnt_mac_reg_bits_off(priv, MAC_REG_PSCFG, PSCFG_AUTOSLEEP);