get rid of pointless checks after simple_pin_fs()

if we'd just got success from it, vfsmount won't be NULL
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/debugfs/inode.c

@@ -160,15 +160,8 @@ static int debugfs_create_by_name(const char *name, mode_t mode,
 	 * block. A pointer to that is in the struct vfsmount that we
 	 * have around.
 	 */
-	if (!parent) {
-		if (debugfs_mount && debugfs_mount->mnt_sb) {
-			parent = debugfs_mount->mnt_sb->s_root;
-		}
-	}
-	if (!parent) {
-		pr_debug("debugfs: Ah! can not find a parent!\n");
-		return -EFAULT;
-	}
+	if (!parent)
+		parent = debugfs_mount->mnt_sb->s_root;
 
 	*dentry = NULL;
 	mutex_lock(&parent->d_inode->i_mutex);

security/inode.c

@@ -156,15 +156,8 @@ static int create_by_name(const char *name, mode_t mode,
 	 * block. A pointer to that is in the struct vfsmount that we
 	 * have around.
 	 */
-	if (!parent ) {
-		if (mount && mount->mnt_sb) {
-			parent = mount->mnt_sb->s_root;
-		}
-	}
-	if (!parent) {
-		pr_debug("securityfs: Ah! can not find a parent!\n");
-		return -EFAULT;
-	}
+	if (!parent)
+		parent = mount->mnt_sb->s_root;
 
 	mutex_lock(&parent->d_inode->i_mutex);
 	*dentry = lookup_one_len(name, parent, strlen(name));