==31523== Conditional jump or move depends on uninitialised value(s)
==31523==    at 0x80585DC: FindColor (colormap.c:1226)
==31523==    by 0x8058CDD: FakeAllocColor (colormap.c:1017)
==31523==    by 0x80D1EFA: miSpriteFindColors (misprite.c:548)
==31523==    by 0x80D226F: miSpriteSetCursor (misprite.c:661)
==31523==    by 0x80CA99A: miPointerUpdateSprite (mipointer.c:343)
==31523==    by 0x80CAAF4: miPointerDisplayCursor (mipointer.c:188)
==31523==    by 0x80E038D: CursorDisplayCursor (cursor.c:136)
==31523==    by 0x811EDC4: AnimCurDisplayCursor (animcur.c:234)
==31523==    by 0x806F18A: DefineInitialRootWindow (events.c:2118)
==31523==    by 0x8078C3C: main (main.c:451)

Trivial fix:
diff --git a/dix/colormap.c b/dix/colormap.c
index 73b6669..8836737 100644
--- a/dix/colormap.c
+++ b/dix/colormap.c
@@ -1013,6 +1013,7 @@ FakeAllocColor (ColormapPtr pmap, xColorItem *item)
     switch (class) {
     case GrayScale:
     case PseudoColor:
+       temp = 0;
        item->pixel = 0;
        if (FindColor(pmap, pmap->red, entries, &rgb, &temp, PSEUDOMAP,
                      -1, AllComp) == Success) {