nfs: remove kfree() redundant null checks

smatch analysis:

fs/nfs/getroot.c:130 nfs_get_root() info: redundant null
 check on name calling kfree()

fs/nfs/unlink.c:272 nfs_async_unlink() info: redundant null
 check on devname_garbage calling kfree()

Cc: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: linux-nfs@vger.kernel.org
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

fs/nfs/getroot.c

@@ -126,7 +126,6 @@ struct dentry *nfs_get_root(struct super_block *sb, struct nfs_fh *mntfh,
 	}
 	spin_unlock(&ret->d_lock);
 out:
-	if (name)
 	kfree(name);
 	nfs_free_fattr(fsinfo.fattr);
 	return ret;

fs/nfs/unlink.c

@@ -268,7 +268,6 @@ nfs_async_unlink(struct inode *dir, struct dentry *dentry)
 	 * point dentry is definitely not a root, so we won't need
 	 * that anymore.
 	 */
-	if (devname_garbage)
 	kfree(devname_garbage);
 	return 0;
 out_unlock: