Fix typo in IsBranchOrLeave()

ICSharpCode.Decompiler/IL/ControlFlow/ConditionDetection.cs

@@ -337,7 +337,7 @@ namespace ICSharpCode.Decompiler.IL.ControlFlow
 					return true;
 				case Leave leave:
 					// only void returns are supported as 'exit points'
-					return !leave.Value.MatchNop();
+					return leave.Value.MatchNop();
 				default:
 					return false;
 			}