'\' should be escaped twice, for the shell, and for tr

tests/test-mq-qimport

@@ -35,7 +35,7 b' hg revert --no-backup foo'
 rm foo
 # Under unix: file:///foobar/blah
 # Under windows: file:///c:/foobar/blah
-patchurl=`echo $HGTMP/url.diff | tr '\\' /`
+patchurl=`echo $HGTMP/url.diff | tr '\\\\' /`
 expr $patchurl : "\/" > /dev/null
 if [ $? -ne 0 ]; then
     patchurl='/'$patchurl