[PATCH] ppc32: Fix string comparing in platform_notify_map

Fixed odd function behavior when dev->bus_id does not contain '.' - it
compared that case 0 characters of the string and hereby reported success and
executed callback. Now bus_id's are compared correctly, extra callback
triggering eliminated.

Signed-off-by: Vitaly Bordug <vbordug@ru.mvista.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/ppc/syslib/ppc_sys.c

@@ -156,12 +156,13 @@ void platform_notify_map(const struct platform_notify_dev_map *map,
 	while (map->bus_id != NULL) {
 		idx = -1;
 		s = strrchr(dev->bus_id, '.');
-		if (s != NULL)
+		if (s != NULL) {
 			idx = (int)simple_strtol(s + 1, NULL, 10);
-		else
+			len = s - dev->bus_id;
+		} else {
 			s = dev->bus_id;
-
-		len = s - dev->bus_id;
+			len = strlen(dev->bus_id);
+		}
 
 		if (!strncmp(dev->bus_id, map->bus_id, len)) {
 			pdev = container_of(dev, struct platform_device, dev);