Fix an out-of-bounds read in assoc_next.

Found using HWASan.

Also sent upstream: https://github.com/andersson/pd-mapper/pull/5

Bug: 171327997
Change-Id: I69d07d0228719abbffb38aa709de39c1d8190158
diff --git a/qcom/pd-mapper/assoc.c b/qcom/pd-mapper/assoc.c
index 692c882..460f0d0 100644
--- a/qcom/pd-mapper/assoc.c
+++ b/qcom/pd-mapper/assoc.c
@@ -128,7 +128,7 @@
 {
 	unsigned long it = *iter;
 
-	while (!assoc->keys[it] && it < assoc->size)
+	while (it < assoc->size && !assoc->keys[it])
 		it++;
 
 	if (it == assoc->size)