Favor Math.[min|max]() over handcrafted code

In line with the general trend toward favoring core JDK APIs for common
tasks in Spring Framework 5.2, this commit replaces handcrafted
statements with Math.min() and Math.max() were applicable.

spring-web/src/main/java/org/springframework/web/multipart/commons/CommonsMultipartFile.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2019 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -109,7 +109,7 @@ public class CommonsMultipartFile implements MultipartFile, Serializable {
 		// Check for Windows-style path
 		int winSep = filename.lastIndexOf('\\');
 		// Cut off at latest possible point
-		int pos = (winSep > unixSep ? winSep : unixSep);
+		int pos = Math.max(winSep, unixSep);
 		if (pos != -1)  {
 			// Any sort of path separator found...
 			return filename.substring(pos + 1);