lib/raid6: update recov_rvv.c zero page usage

Update lib/raid6/recov_rvv.c, for 1857fcc84744 ("lib/raid6: replace custom
zero page with ZERO_PAGE"), per Klara.

Link: https://lkml.kernel.org/r/[e-mail]
Fixes: 1857fcc84744 ("lib/raid6: replace custom zero page with ZERO_PAGE")
Signed-off-by: Herbert Xu <[e-mail]>
Cc: Song Liu <[e-mail]>
Cc: Yu Kuai <[e-mail]>
Cc: Klara Modin <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>

lib/raid6/recov_rvv.c

···
 	 * delta p and delta q
 	 */
 	dp = (u8 *)ptrs[faila];
-	ptrs[faila] = (void *)raid6_empty_zero_page;
+	ptrs[faila] = raid6_get_zero_page();
 	ptrs[disks - 2] = dp;
 	dq = (u8 *)ptrs[failb];
-	ptrs[failb] = (void *)raid6_empty_zero_page;
+	ptrs[failb] = raid6_get_zero_page();
 	ptrs[disks - 1] = dq;
 
 	raid6_call.gen_syndrome(disks, bytes, ptrs);
···
 	 * Use the dead data page as temporary storage for delta q
 	 */
 	dq = (u8 *)ptrs[faila];
-	ptrs[faila] = (void *)raid6_empty_zero_page;
+	ptrs[faila] = raid6_get_zero_page();
 	ptrs[disks - 1] = dq;
 
 	raid6_call.gen_syndrome(disks, bytes, ptrs);