lib/radix-tree: remove unused argument of insert_entries

insert_entries() doesn't use the 'bool replace' argument, and the function
is only used locally, remove the argument.

The historical context of the unused argument is as follow:

2: commit <3a08cd52c37c79> (radix tree: Remove multiorder support)
Remove the code related to macro CONFIG_RADIX_TREE_MULTIORDER
to convert to the xArray.
Without the macro, there is no need to retain the argument.

1: commit <175542f575723e> (radix-tree: add radix_tree_join)
Add insert_entries(..., bool replace) function, depending on the
macro CONFIG_RADIX_TREE_MULTIORDER definition, the implementation
is different. Notice that the implementation without the macro doesn't
use the argument.

[Matthew Wilcox: add historical context for argument]

Link: https://lkml.kernel.org/r/[e-mail]
Signed-off-by: wuchi <[e-mail]>
Cc: Matthew Wilcox <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>

lib/radix-tree.c

···
 }
 
 static inline int insert_entries(struct radix_tree_node *node,
-		void __rcu **slot, void *item, bool replace)
+		void __rcu **slot, void *item)
 {
 	if (*slot)
 		return -EEXIST;
···
 	if (error)
 		return error;
 
-	error = insert_entries(node, slot, item, false);
+	error = insert_entries(node, slot, item);
 	if (error < 0)
 		return error;