autofs4: remove unneeded null check in try_to_fill_dentry()

After 97e7449a7ad: "autofs4: fix indirect mount pending expire race" we no
longer assumed that "ino" can be null.  The other null checks got removed
but this was one was missed.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Cc: Ian Kent <raven@themaw.net>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/autofs4/root.c b/fs/autofs4/root.c
index 48e056e..cb1bd38 100644
--- a/fs/autofs4/root.c
+++ b/fs/autofs4/root.c
@@ -204,8 +204,7 @@
 	}
 
 	/* Initialize expiry counter after successful mount */
-	if (ino)
-		ino->last_used = jiffies;
+	ino->last_used = jiffies;
 
 	spin_lock(&sbi->fs_lock);
 	ino->flags &= ~AUTOFS_INF_PENDING;