Replace unnecessary `?.`s with `.`.

They were triggering a lint (null_aware_in_logical_operator).

Change-Id: Ia6124ae4828270b1d231b44199c376adc04fcc79
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/96848
Auto-Submit: Paul Berry <paulberry@google.com>
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
Commit-Queue: Paul Berry <paulberry@google.com>
diff --git a/pkg/analyzer/lib/src/generated/static_type_analyzer.dart b/pkg/analyzer/lib/src/generated/static_type_analyzer.dart
index c5c8cfa..23fad84 100644
--- a/pkg/analyzer/lib/src/generated/static_type_analyzer.dart
+++ b/pkg/analyzer/lib/src/generated/static_type_analyzer.dart
@@ -2003,9 +2003,9 @@
       elementType != null &&
       elementType.isDynamic &&
       keyType != null &&
-      keyType?.isDynamic &&
+      keyType.isDynamic &&
       valueType != null &&
-      valueType?.isDynamic;
+      valueType.isDynamic;
 
   bool get mustBeAMap => canBeAMap && elementType == null;