Normalize _bt_findsplitloc() argument names.
Oversight in commit
@@ -1050,7 +1050,7 @@ extern Buffer _bt_getstackbuf(Relation rel, BTStack stack, BlockNumber child);
/*
* prototypes for functions in nbtsplitloc.c
*/
-extern OffsetNumber _bt_findsplitloc(Relation rel, Page page,
+extern OffsetNumber _bt_findsplitloc(Relation rel, Page origpage,
OffsetNumber newitemoff, Size newitemsz, IndexTuple newitem,
bool *newitemonleft);
