module: zfs: arc: hdr_full_crypt_dest: drop unevaulated-only variable

This explodes as -Wunused-variable on GCC 8.5.0, despite it being used, just not in an evaulated context Closes openzfs#13194 Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
nabijaczleweli · Mar 11, 2022 · 86e9b22 · 86e9b22
1 parent 1282274
commit 86e9b22
Showing 1 changed file with 2 additions and 3 deletions.
diff --git a/module/zfs/arc.c b/module/zfs/arc.c
@@ -1204,11 +1204,10 @@ 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