Add scandir error check to avoid excess warnings

Function uio_list_attr calls scandir() with /attr/ ammended to uio
device path. In file systems without this directory lsuio returns a
warning message for each uio device resulting in additional unnecessary
output to console.

Signed-off-by: Tomas McMonigal <[email protected]>

attr.c

@@ -67,6 +67,9 @@ char **uio_list_attr (struct uio_info_t* info)
 	nr = scandir (path, &namelist, 0, alphasort);
 	if (nr < 0)
 	{
+		if (ENOENT == errno){
+			return NULL;
+		}
 		g_warning (_("scandir: %s"), g_strerror (errno));
 		return NULL;
 	}