x86/mm/pat: cpa-test: fix length for CPA_ARRAY test

jira LE-4694
Rebuild_History Non-Buildable kernel-6.12.0-55.43.1.el10_0
commit-author Mike Rapoport (Microsoft) <rppt@kernel.org>
commit 33ea120

The CPA_ARRAY test always uses len[1] as numpages argument to
change_page_attr_set() although the addresses array is different each
iteration of the test loop.

Replace len[1] with len[i] to have numpages matching the addresses array.

Fixes: ecc729f ("x86/mm/cpa: Add ARRAY and PAGES_ARRAY selftests")
	Signed-off-by: "Mike Rapoport (Microsoft)" <rppt@kernel.org>
	Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20250126074733.1384926-2-rppt@kernel.org
(cherry picked from commit 33ea120)
	Signed-off-by: Jonathan Maple <jmaple@ciq.com>

Author: PlaidCat

arch/x86/mm/pat/cpa-test.c

@@ -183,7 +183,7 @@ static int pageattr_test(void)
 			break;
 
 		case 1:
-			err = change_page_attr_set(addrs, len[1], PAGE_CPA_TEST, 1);
+			err = change_page_attr_set(addrs, len[i], PAGE_CPA_TEST, 1);
 			break;
 
 		case 2: