tools/libs/ctrl: don't set errno to a negative value

The claimed reason for setting errno to -1 is wrong. On x86
xc_domain_pod_target() will set errno to a sane value in the error
case.

Fixes: ff1745d588 ("tools: libxl: do not set the PoD target on ARM")
Signed-off-by: Juergen Gross <jgross@suse.com>
Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>
master commit: a0fb7e0e73
master date: 2022-04-22 20:39:34 +0100

tools/libs/ctrl/xc_domain.c

@@ -1276,9 +1276,7 @@ int xc_domain_get_pod_target(xc_interface *xch,
                              uint64_t *pod_cache_pages,
                              uint64_t *pod_entries)
 {
-    /* On x86 (above) xc_domain_pod_target will incorrectly return -1
-     * with errno==-1 on error. Do the same for least surprise. */
-    errno = -1;
+    errno = EOPNOTSUPP;
     return -1;
 }
 #endif