[Stable-8.0.3 30/54] qga: Fix suspend on Linux guests without systemd

[Michael Tokarev]

From: Mark Somerville <mark@qpok.net>

Allow the Linux guest agent to attempt each of the suspend methods
(systemctl, pm-* and writing to /sys) in turn.

Prior to this guests without systemd failed to suspend due to
`guest_suspend` returning early regardless of the return value of
`systemd_supports_mode`.

Signed-off-by: Mark Somerville <mark@qpok.net>
Reviewed-by: Konstantin Kostiuk <kkostiuk@redhat.com>
Signed-off-by: Konstantin Kostiuk <kkostiuk@redhat.com>
(cherry picked from commit 86dcb6ab9b603450eb6d896cdc95286de2c7d561)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

diff --git a/qga/commands-posix.c b/qga/commands-posix.c
index 079689d79a..59e7154af4 100644
--- a/qga/commands-posix.c
+++ b/qga/commands-posix.c
@@ -1918,10 +1918,10 @@ static void guest_suspend(SuspendMode mode, Error 
**errp)
     if (systemd_supports_mode(mode, &local_err)) {
         mode_supported = true;
         systemd_suspend(mode, &local_err);
-    }
 
-    if (!local_err) {
-        return;
+        if (!local_err) {
+            return;
+        }
     }
 
     error_free(local_err);
@@ -1930,10 +1930,10 @@ static void guest_suspend(SuspendMode mode, Error 
**errp)
     if (pmutils_supports_mode(mode, &local_err)) {
         mode_supported = true;
         pmutils_suspend(mode, &local_err);
-    }
 
-    if (!local_err) {
-        return;
+        if (!local_err) {
+            return;
+        }
     }
 
     error_free(local_err);
-- 
2.39.2