[xserver] xfree86: fix Xorg memory leak when run xrandr

[Xiaogang Chen]

xf86DDCGetModes generates some DisplayMods that are not used and not released after.
Fixes: https://bugs.freedesktop.org/show_bug.cgi?id=99521

Signed-off-by: Xiaogang Chen <Xiaogang.Chen at amd.com>
---
 hw/xfree86/modes/xf86EdidModes.c | 17 +++++------------
 1 file changed, 5 insertions(+), 12 deletions(-)

diff --git a/hw/xfree86/modes/xf86EdidModes.c b/hw/xfree86/modes/xf86EdidModes.c
index f0e1e97..915b291 100644
--- a/hw/xfree86/modes/xf86EdidModes.c
+++ b/hw/xfree86/modes/xf86EdidModes.c
@@ -1201,18 +1201,11 @@ xf86EdidMonitorSet(int scrnIndex, MonPtr Monitor, xf86MonPtr DDC)
         /* look for last Mode */
         Mode = Modes;
 
-        while (Mode->next)
-            Mode = Mode->next;
+        /*release these video modes that are not used after*/
+        while (Mode) {
+           xf86DeleteMode(&Modes, Mode);
+           Mode = Modes;
+       }
 
-        /* add to MonPtr */
-        if (Monitor->Modes) {
-            Monitor->Last->next = Modes;
-            Modes->prev = Monitor->Last;
-            Monitor->Last = Mode;
-        }
-        else {
-            Monitor->Modes = Modes;
-            Monitor->Last = Mode;
-        }
     }
 }
-- 
2.7.4