Fix another memory leak

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%40412

src/video/Xext/Xv/Xv.c

@@ -267,6 +267,7 @@ SDL_NAME(XvQueryAdaptors)(
   *p_nAdaptors = rep.num_adaptors;
   *p_pAdaptors = pas;
 
+  Xfree(buffer);
   UnlockDisplay(dpy);
   SyncHandle();