From 2373bd1e91973818b1f60abf1c7cd029ef9329b0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=D0=BD=D0=B0=D0=B1?= <nabijaczleweli@nabijaczleweli.xyz>
Date: Sat, 19 Mar 2022 00:53:05 +0100
Subject: [PATCH] module: zfs: arc: hdr_full_crypt_dest: drop unevaulated-only
 variable
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This explodes as -Wunused-variable on GCC 8.5.0, despite it being used,
just not in an evaluated context

Reviewed-by: Matthew Ahrens <mahrens@delphix.com>
Reviewed-by: Ryan Moeller <freqlabs@FreeBSD.org>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #13195
---
 module/zfs/arc.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/module/zfs/arc.c b/module/zfs/arc.c
index 08df2870f4b2..b5c9b3edcaca 100644
--- a/module/zfs/arc.c
+++ b/module/zfs/arc.c
@@ -1204,11 +1204,11 @@ hdr_full_dest(void *vbuf, void *unused)
 static void
 hdr_full_crypt_dest(void *vbuf, void *unused)
 {
-	(void) unused;
-	arc_buf_hdr_t *hdr = vbuf;
+	(void) vbuf, (void) unused;
 
 	hdr_full_dest(vbuf, unused);
-	arc_space_return(sizeof (hdr->b_crypt_hdr), ARC_SPACE_HDRS);
+	arc_space_return(sizeof (((arc_buf_hdr_t *)NULL)->b_crypt_hdr),
+	    ARC_SPACE_HDRS);
 }
 
 static void