xext: don't free uninitialised pointer when malloc fails. (v2)

Initialise the pAttr->values to values so if the values allocation
fails it just ends up as free(NULL).

Pointed out by coverity.

v2: use Alan's suggestion.

Signed-off-by: Dave Airlie <airlied@redhat.com>
Reviewed-by: Alan Coopersmith <alan.coopersmith@oracle.com>
Reviewed-by: Jeremy Huddleston <jeremyhu@apple.com>
(cherry picked from commit b62dc4fcbc)

Xext/saver.c

@@ -927,7 +927,7 @@ ScreenSaverSetAttributes (ClientPtr client)
 	goto bail;
     }
     /* over allocate for override redirect */
-    values = malloc((len + 1) * sizeof (unsigned long));
+    pAttr->values = values = malloc((len + 1) * sizeof (unsigned long));
     if (!values)
     {
 	ret = BadAlloc;
@@ -947,7 +947,6 @@ ScreenSaverSetAttributes (ClientPtr client)
     pAttr->pCursor = NullCursor;
     pAttr->pBackgroundPixmap = NullPixmap;
     pAttr->pBorderPixmap = NullPixmap;
-    pAttr->values = values;
     /*
      * go through the mask, checking the values,
      * looking up pixmaps and cursors and hold a reference