sys/uvm: fix uao_dropswap() index typo

tech@,

the loop variable indexes the current pgs[] batch, not the page within the
object. Pass the fetched page's object offset to uao_dropswap(), as the
other resident page callers do.

Thoughts? Ok?

Index: sys/uvm/uvm_object.c
===================================================================
RCS file: /home/cvs/src/sys/uvm/uvm_object.c,v
diff -u -p -r1.28 uvm_object.c
--- sys/uvm/uvm_object.c	10 Dec 2025 08:38:18 -0000	1.28
+++ sys/uvm/uvm_object.c	22 Jul 2026 14:31:58 -0000
@@ -156,7 +156,7 @@ uvm_obj_wire(struct uvm_object *uobj, vo
 			if (pgs[i]->pg_flags & PQ_AOBJ) {
 				atomic_clearbits_int(&pgs[i]->pg_flags,
 				    PG_CLEAN);
-				uao_dropswap(uobj, i);
+				uao_dropswap(uobj, pgs[i]->offset >> PAGE_SHIFT);
 			}
 		}
 

-- 
wbr, Kirill