DPA_Search: Handle DPAS_INSERTBEFORE on empty list.

diff --git a/dlls/comctl32/comctl32undoc.c b/dlls/comctl32/comctl32undoc.c
index e0033d6..73ef986 100644
--- a/dlls/comctl32/comctl32undoc.c
+++ b/dlls/comctl32/comctl32undoc.c
@@ -2179,6 +2179,7 @@
 	}
 
 	if (uOptions & DPAS_INSERTBEFORE) {
+	    if (r == -1) r = 0;
 	    TRACE("-- ret=%d\n", r);
 	    return r;
 	}