[PATCH] remove unneeded test from radix_tree_extend()

Patch from: Szabolcs Berecz <szabi@mplayerhq.hu>

No need to check root->rnode in the loop. In the loop it remains nonzero.

lib/radix-tree.c

@@ -154,7 +154,6 @@ static int radix_tree_extend(struct radix_tree_root *root, unsigned long index)
 
 			/* Increase the height.  */
 			node->slots[0] = root->rnode;
-			if (root->rnode)
 			node->count = 1;
 			root->rnode = node;
 			root->height++;