Specify Locale for upcasing

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/net/trunk@1788538 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/src/main/java/org/apache/commons/net/ftp/parser/OS400FTPEntryParser.java b/src/main/java/org/apache/commons/net/ftp/parser/OS400FTPEntryParser.java
index 7831ffa..821a936 100644
--- a/src/main/java/org/apache/commons/net/ftp/parser/OS400FTPEntryParser.java
+++ b/src/main/java/org/apache/commons/net/ftp/parser/OS400FTPEntryParser.java
@@ -19,6 +19,7 @@
 
 import java.io.File;
 import java.text.ParseException;
+import java.util.Locale;
 
 import org.apache.commons.net.ftp.FTPClientConfig;
 import org.apache.commons.net.ftp.FTPFile;
@@ -335,7 +336,7 @@
                 // file.
                 // Save files are a special type of files which are used
                 // to save objects, e.g. for backups.
-                if (name != null && name.toUpperCase().endsWith(".SAVF"))
+                if (name != null && name.toUpperCase(Locale.ROOT).endsWith(".SAVF"))
                 {
                     mustScanForPathSeparator = false;
                     type = FTPFile.FILE_TYPE;