XcmsLookupColor: fully initialize XColor structs passed to _XColor_to_XcmsRGB

Fixes #44
aka https://bugs.freedesktop.org/show_bug.cgi?id=92154Reviewed-by: Alan Coopersmith <alan.coopersmith@oracle.com>
Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>

src/xcms/cmsLkCol.c

@@ -76,7 +76,8 @@ XcmsLookupColor (
     register int n;
     xLookupColorReply reply;
     register xLookupColorReq *req;
-    XColor def, scr;
+    XColor def = {0,};
+    XColor scr = {0,};
 
 /*
  * 0. Check for invalid arguments.