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sdrip/rename.rc: exit 0 if no files to process

--- a/sdrip/rename.rc

+++ b/sdrip/rename.rc

@@ -1,11 +1,19 @@

-#!/bin/rc -e

+#!/bin/rc

+flag e +

+

 . ./fns.rc

 rename webp WEBP -- *.webp >[2]/dev/null || {}

 rename jpg JPG -- *.jpg >[2]/dev/null || {}

 rename png PNG -- *.png >[2]/dev/null || {}

-exiv2 -q --Force -t rename `{lscmd >[2]/dev/null} || true

+

+files=`{lscmd >[2]/dev/null}

+

+if(~ $#files 0)

+	exit 0

+

+exiv2 -q --Force -t rename $files || {}

 sha1sum -- `{lscmd >[2]/dev/null} | awk '

 function quote(s){