bugzilla report 37386: <checksum> with file and todir fails

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@447165 13f79535-47bb-0310-9956-ffa450edef68

WHATSNEW

@@ -10,6 +10,8 @@ Changes that could break older environments:
 Fixed bugs:
 -----------
 
+* <checksum> with file and todir option failed. Bugzilla report 37386.
+
 Other changes:
 --------------
 

src/main/org/apache/tools/ant/taskdefs/Checksum.java

@@ -398,6 +398,10 @@ public class Checksum extends MatchingTask implements Condition {
                 }
             }
             if (file != null) {
+                if (totalproperty != null || todir != null) {
+                    relativeFilePaths.put(
+                        file, file.getName().replace(File.separatorChar, '/'));
+                }
                 addToIncludeFileMap(file);
             }
             return generateChecksums();