Fix a memory leak in the OSS driver. The path name and an error

string were leaking whenever open succeeded on the non-devfs
device path.


git-svn-id: http://svn.xiph.org/trunk/ao@9575 0101bb08-14d6-0310-b084-bc0e0c8e3800

src/plugins/oss/ao_oss.c

@@ -125,12 +125,13 @@ int _open_default_oss_device (char **dev_path, int blocking)
 				"  %s - %s\n",
 				err, dev,
 				strerror(errno), *dev_path); */
-		free(err);
-		free(dev);
 		free(*dev_path);
 		*dev_path = NULL;
 	}
 
+	if (err) free(err);
+	if (dev) free(dev);
+
 	return fd;
 }