[PATCH] vl: fix "type is NULL" in -vga help

[marcandre . lureau]

From: Marc-André Lureau <marcandre.lureau@redhat.com>

Don't pass NULL to module_object_class_by_name(), when the interface is
unavailable.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
---
 system/vl.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/system/vl.c b/system/vl.c
index bdd2f6ecf6..9e8f16f155 100644
--- a/system/vl.c
+++ b/system/vl.c
@@ -1000,9 +1000,16 @@ static bool vga_interface_available(VGAInterfaceType t)
     const VGAInterfaceInfo *ti = &vga_interfaces[t];
 
     assert(t < VGA_TYPE_MAX);
-    return !ti->class_names[0] ||
-           module_object_class_by_name(ti->class_names[0]) ||
-           module_object_class_by_name(ti->class_names[1]);
+
+    if (!ti->class_names[0] || 
module_object_class_by_name(ti->class_names[0])) {
+        return true;
+    }
+
+    if (ti->class_names[1] && module_object_class_by_name(ti->class_names[1])) 
{
+        return true;
+    }
+
+    return false;
 }
 
 static const char *
-- 
2.45.2.827.g557ae147e6