[PATCH] xf86: return NULL for compat output if no outputs.

[Dave Airlie]

From: Dave Airlie <airlied at redhat.com>

With outputless GPUs showing up we crash here if there are not outputs
try and recover with a bit of grace.

Signed-off-by: Dave Airlie <airlied at redhat.com>
---
 hw/xfree86/modes/xf86Crtc.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/hw/xfree86/modes/xf86Crtc.c b/hw/xfree86/modes/xf86Crtc.c
index 803de88..7419400 100644
--- a/hw/xfree86/modes/xf86Crtc.c
+++ b/hw/xfree86/modes/xf86Crtc.c
@@ -1764,6 +1764,9 @@ SetCompatOutput(xf86CrtcConfigPtr config)
     DisplayModePtr maxmode = NULL, testmode, mode;
     int o, compat = -1, count, mincount = 0;
 
+    if (config->num_output == 0)
+        return NULL;
+
     /* Look for one that's definitely connected */
     for (o = 0; o < config->num_output; o++) {
         test = config->output[o];
-- 
1.7.10.2