Fix a few nits found by PVS Studio

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index 74a16baa340fd46bf81554f510a0ee457e8341c9..9933e9c61497c8d3307ea4643cc96b65bc0eca07 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -7197,7 +7197,7 @@ class IntrusiveMapTransitionIterator {
     int value = Smi::cast(*IteratorField())->value();
     int index = -value - 1;
     int number_of_transitions = transition_array_->number_of_transitions();
-    while (index < number_of_transitions) {
+    if (index < number_of_transitions) {
       *IteratorField() = Smi::FromInt(value - 1);
       return transition_array_->GetTarget(index);
     }