[WATCHDOG] VFS clean-up

All watchdog device drivers are VFSs (Virtual File Systems).
We thus return a nonseekable_open(inode, file) when we open the VFS.

Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

diff --git a/drivers/char/watchdog/booke_wdt.c b/drivers/char/watchdog/booke_wdt.c
index 0f5c77d..d362f5b 100644
--- a/drivers/char/watchdog/booke_wdt.c
+++ b/drivers/char/watchdog/booke_wdt.c
@@ -144,7 +144,7 @@
 				booke_wdt_period);
 	}
 
-	return 0;
+	return nonseekable_open(inode, file);
 }
 
 static const struct file_operations booke_wdt_fops = {